Hi, I am also getting this error. I tried everything but could not get it to work. The Software-Center worked fine when I first installed the system. Here is my log file, sorry it's so long: 2011-12-18 16:34:39,962 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 16:34:41,233 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 16:34:41,310 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 16:34:46,503 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-18 17:04:42,842 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:04:46,630 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 17:04:46,708 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 17:05:04,767 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-18 17:05:05,135 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-18 17:07:28,979 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:07:29,768 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 17:07:29,827 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 17:07:46,958 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-18 17:07:47,102 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-18 17:18:56,825 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:19:01,450 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 17:19:01,536 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 17:19:20,116 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-18 17:19:20,482 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-18 17:31:30,633 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:31:31,386 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 17:31:31,445 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 17:31:49,226 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-18 17:31:49,380 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-18 17:35:15,439 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:38:02,970 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-18 17:38:03,708 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-18 17:38:03,771 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-18 17:38:20,951 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-18 17:38:21,105 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-20 05:25:57,814 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-20 05:25:59,315 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-20 05:25:59,412 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-20 05:26:19,992 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-20 05:26:20,315 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-20 14:31:38,924 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-20 14:31:41,548 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-20 14:31:41,629 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-20 14:32:01,001 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(11, 'Resource temporarily unavailable -- unable to join the environment')' (corrupted?) 2011-12-20 14:32:01,351 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-21 11:03:04,158 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-21 11:03:06,007 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-21 11:03:06,084 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-21 11:03:12,543 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-24 06:14:10,680 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-24 06:14:12,787 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-24 06:14:12,854 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-24 06:14:17,048 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-24 09:27:43,349 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2011-12-24 09:27:45,429 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2011-12-24 09:27:45,501 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2011-12-24 09:27:49,576 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0 2011-12-24 09:30:16,281 - softwarecenter.utils - WARNING - Could not determine the installed desktop file path for app-install desktop file: 'None' 2012-01-01 09:31:08,791 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:31:08,792 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:31:10,817 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:31:10,826 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:31:10,895 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:31:10,898 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:31:11,810 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/share/software-center/update-software-center-agent', 92, '')' 2012-01-01 09:31:11,810 - root - WARNING - Another instance of the update agent already holds a write lock on /home/ace/.cache/software-center/software-center-agent.db.tmp 2012-01-01 09:32:30,443 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:32:54,370 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:32:55,583 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:32:55,583 - dbus.proxies - ERROR - Introspect error on :1.420:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:33:18,576 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:33:18,576 - dbus.proxies - ERROR - Introspect error on :1.420:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Disconnected: Connection was disconnected before a reply was received 2012-01-01 09:35:46,140 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:35:52,814 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:35:52,944 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:36:21,035 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:36:22,764 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:36:38,045 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:36:46,165 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:36:46,164 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:36:47,917 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:36:47,917 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:37:03,189 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:37:03,188 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:37:11,897 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:37:11,958 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:37:13,686 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:37:13,750 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:37:14,801 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/share/software-center/update-software-center-agent', 92, '')' 2012-01-01 09:37:14,800 - root - WARNING - Another instance of the update agent already holds a write lock on /home/ace/.cache/software-center/software-center-agent.db.tmp 2012-01-01 09:37:16,324 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:37:25,510 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:37:28,939 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:37:29,005 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:37:29,786 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:37:41,459 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:37:41,458 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:37:50,648 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:37:50,648 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:37:54,944 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:37:54,944 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:38:07,181 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:38:07,246 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:38:16,359 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:38:16,423 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:38:20,672 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:38:20,733 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:50:33,034 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:50:58,193 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:50:58,193 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:51:23,944 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:51:24,002 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:53:12,073 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:53:37,233 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:53:37,233 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:53:46,480 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 09:54:02,961 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:54:03,030 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 09:54:11,613 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 09:54:11,613 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 09:54:37,387 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 09:54:37,445 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 10:18:05,964 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 10:18:31,105 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 10:18:31,104 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 10:18:56,815 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 10:18:56,890 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 10:27:11,740 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 10:27:36,901 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 10:27:36,900 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 10:28:02,646 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 10:28:02,706 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 10:39:05,659 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 10:39:30,816 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 10:39:30,816 - dbus.proxies - ERROR - Introspect error on :1.116:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 10:39:56,525 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 10:39:56,587 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:25:17,456 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:25:19,446 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:25:19,543 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:28:28,198 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:28:53,342 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 14:28:53,342 - dbus.proxies - ERROR - Introspect error on :1.154:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 14:29:19,074 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:29:19,135 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:38:03,976 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:38:04,835 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:38:04,892 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:43:40,680 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:43:45,194 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:43:45,293 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:46:33,652 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:46:38,967 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:46:39,053 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:50:16,335 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:50:41,481 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 406, '_introspect_error_handler')' 2012-01-01 14:50:41,480 - dbus.proxies - ERROR - Introspect error on :1.91:/com/ubuntu/Softwarecenter: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. 2012-01-01 14:51:07,210 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:51:07,277 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css 2012-01-01 14:51:30,423 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 15 21 2012-01-01 14:51:31,232 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-01-01 14:51:31,291 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css/usr/share/software-center/ui/gtk3/css/softwarecenter.css