Having the same bug at startup, I saw on a duplicate that you need a backtrace so I tried to have one but I don't think it worked : the program did'nt seens to crash again. Not being sure (I'm not english speaker and I'm a newbee in bug tracking), I prefer send you my log anyway : You'll better known if it is usefull. So Here is what I get : julien@julien-fixe:~$ gdb gnome-power-manager 2>&1 | tee ~/gdb-gnome-power-manager.txt GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2 Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/bin/gnome-power-manager...Reading symbols from /usr/lib/debug/usr/bin/gnome-power-manager...done. done. (gdb) handle SIG33 pass nostop noprint Signal Stop Print Pass to program Description SIG33 No No Yes Real-time event 33 (gdb) set pagination 0 (gdb) run Starting program: /usr/bin/gnome-power-manager [Thread debugging using libthread_db enabled] [New Thread 0xb5534b70 (LWP 21586)] [New Thread 0xb4bffb70 (LWP 21588)] *** ERROR *** TI:16:49:52 TH:0x8094328 FI:gpm-main.c FN:main,250 - Gestionnaire d'énergie is already running in this session. Traceback: /usr/bin/gnome-power-manager() [0x8063bdb] /usr/bin/gnome-power-manager() [0x80576c2] /lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0xb758fe37] /usr/bin/gnome-power-manager() [0x804dcc1] [Thread 0xb4bffb70 (LWP 21588) exited] [Thread 0xb5534b70 (LWP 21586) exited] Program exited with code 01. (gdb) backtrace full No stack. (gdb) info registers The program has no registers now. (gdb) x/16i $pc No registers. (gdb) thread apply all backtrace (gdb) quit julien@julien-fixe:~$ pidof gnome-power-manager 1513 julien@julien-fixe:~$ gdb 2>&1 | tee ~/gdb-gnome-power-manager.txt GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2 Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-linux-gnu". For bug reporting instructions, please see: . (gdb) handle SIG33 pass nostop noprint Signal Stop Print Pass to program Description SIG33 No No Yes Real-time event 33 (gdb) set pagination 0 (gdb) attach 1513 Attaching to process 1513 Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Opération non permise. (gdb) quit julien@julien-fixe:~$ sudo gdb 2>&1 | tee ~/gdb-gnome-power-manager.txt GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2 Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-linux-gnu". For bug reporting instructions, please see: . (gdb) handle SIG33 pass nostop noprint Signal Stop Print Pass to program Description SIG33 No No Yes Real-time event 33 (gdb) set pagination 0 (gdb) attach 1513 Attaching to process 1513 Reading symbols from /usr/bin/gnome-power-manager...Reading symbols from /usr/lib/debug/usr/bin/gnome-power-manager...done. done. Reading symbols from /usr/lib/libgconf-2.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgconf-2.so.4 Reading symbols from /usr/lib/libgnome-keyring.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgnome-keyring.so.0 Reading symbols from /usr/lib/libappindicator.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libappindicator.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXrandr.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXrandr.so.2 Reading symbols from /usr/lib/i386-linux-gnu/libX11.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libX11.so.6 Reading symbols from /usr/lib/i386-linux-gnu/libXext.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXext.so.6 Reading symbols from /usr/lib/libcanberra-gtk.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libcanberra-gtk.so.0 Reading symbols from /usr/lib/libcanberra.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libcanberra.so.0 Reading symbols from /usr/lib/libnotify.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnotify.so.1 Reading symbols from /usr/lib/libgtk-x11-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgtk-x11-2.0.so.0 Reading symbols from /usr/lib/libdbus-glib-1.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdbus-glib-1.so.2 Reading symbols from /usr/lib/libgdk-x11-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgdk-x11-2.0.so.0 Reading symbols from /usr/lib/libgdk_pixbuf-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgdk_pixbuf-2.0.so.0 Reading symbols from /usr/lib/libcairo.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libcairo.so.2 Reading symbols from /lib/i386-linux-gnu/libdbus-1.so.3...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libdbus-1.so.3 Reading symbols from /lib/i386-linux-gnu/libpthread.so.0...(no debugging symbols found)...done. [Thread debugging using libthread_db enabled] [New Thread 0xb4ca9b70 (LWP 1519)] Loaded symbols for /lib/i386-linux-gnu/libpthread.so.0 Reading symbols from /usr/lib/libupower-glib.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libupower-glib.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libgthread-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libgthread-2.0.so.0 Reading symbols from /lib/i386-linux-gnu/libglib-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libglib-2.0.so.0 Reading symbols from /lib/i386-linux-gnu/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libm.so.6 Reading symbols from /lib/i386-linux-gnu/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libc.so.6 Reading symbols from /usr/lib/i386-linux-gnu/libgio-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libgio-2.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libgmodule-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libgmodule-2.0.so.0 Reading symbols from /usr/lib/libORBit-2.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libORBit-2.so.0 Reading symbols from /lib/i386-linux-gnu/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/librt.so.1 Reading symbols from /lib/i386-linux-gnu/libgcrypt.so.11...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libgcrypt.so.11 Reading symbols from /usr/lib/libindicator.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libindicator.so.3 Reading symbols from /usr/lib/libdbusmenu-gtk.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdbusmenu-gtk.so.3 Reading symbols from /usr/lib/libdbusmenu-glib.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdbusmenu-glib.so.3 Reading symbols from /usr/lib/i386-linux-gnu/libatk-1.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libatk-1.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libpangocairo-1.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libpangocairo-1.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libpango-1.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libpango-1.0.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libfreetype.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libfreetype.so.6 Reading symbols from /usr/lib/i386-linux-gnu/libfontconfig.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libfontconfig.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXrender.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXrender.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libxcb.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libxcb.so.1 Reading symbols from /lib/i386-linux-gnu/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libdl.so.2 Reading symbols from /usr/lib/libvorbisfile.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libvorbisfile.so.3 Reading symbols from /usr/lib/libtdb.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libtdb.so.1 Reading symbols from /usr/lib/libltdl.so.7...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libltdl.so.7 Reading symbols from /usr/lib/i386-linux-gnu/libXcomposite.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXcomposite.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXdamage.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXdamage.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXfixes.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXfixes.so.3 Reading symbols from /usr/lib/i386-linux-gnu/libXinerama.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXinerama.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXi.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXi.so.6 Reading symbols from /usr/lib/i386-linux-gnu/libXcursor.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXcursor.so.1 Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpixman-1.so.0 Reading symbols from /usr/lib/libEGL.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libEGL.so.1 Reading symbols from /lib/i386-linux-gnu/libpng12.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libpng12.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libxcb-shm.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libxcb-shm.so.0 Reading symbols from /usr/lib/i386-linux-gnu/libxcb-render.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libxcb-render.so.0 Reading symbols from /lib/i386-linux-gnu/libz.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libz.so.1 Reading symbols from /usr/lib/nvidia-current/libGL.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/libGL.so.1 Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /lib/i386-linux-gnu/libpcre.so.3...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libpcre.so.3 Reading symbols from /lib/i386-linux-gnu/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libresolv.so.2 Reading symbols from /lib/i386-linux-gnu/libselinux.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libselinux.so.1 Reading symbols from /lib/i386-linux-gnu/libgpg-error.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libgpg-error.so.0 Reading symbols from /lib/i386-linux-gnu/libexpat.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libexpat.so.1 Reading symbols from /usr/lib/i386-linux-gnu/libXau.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXau.so.6 Reading symbols from /usr/lib/i386-linux-gnu/libXdmcp.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/i386-linux-gnu/libXdmcp.so.6 Reading symbols from /usr/lib/libvorbis.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libvorbis.so.0 Reading symbols from /usr/lib/libogg.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libogg.so.0 Reading symbols from /usr/lib/nvidia-current/tls/libnvidia-tls.so.270.30...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/tls/libnvidia-tls.so.270.30 Reading symbols from /usr/lib/nvidia-current/libnvidia-glcore.so.270.30...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/libnvidia-glcore.so.270.30 Reading symbols from /lib/i386-linux-gnu/libnss_compat.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libnss_compat.so.2 Reading symbols from /lib/i386-linux-gnu/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libnsl.so.1 Reading symbols from /lib/i386-linux-gnu/libnss_nis.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libnss_nis.so.2 Reading symbols from /lib/i386-linux-gnu/libnss_files.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i386-linux-gnu/libnss_files.so.2 Reading symbols from /usr/lib/liboverlay-scrollbar-0.1.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liboverlay-scrollbar-0.1.so.0 Reading symbols from /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so Reading symbols from /usr/lib/gtk-2.0/2.10.0/engines/libmurrine.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/gtk-2.0/2.10.0/engines/libmurrine.so Reading symbols from /usr/lib/gtk-2.0/2.10.0/engines/libpixmap.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/gtk-2.0/2.10.0/engines/libpixmap.so Reading symbols from /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so 0xb7756424 in __kernel_vsyscall () (gdb) continue Continuing.