1. Reboot
2. Login (Ubuntu 2D)
$ ps axw |grep ibus
 2195 ?        Sl     0:00 /usr/bin/ibus-daemon --xim
 2224 ?        Z      0:00 [ibus-gconf] <defunct>
 2244 ?        Z      0:00 [ibus-engine-m17] <defunct>
 2611 ?        Sl     0:00 /usr/lib/ibus/ibus-gconf
 2613 ?        Sl     0:00 /usr/bin/python /usr/share/ibus/ui/gtk/main.py
 2615 ?        Sl     0:00 /usr/lib/ibus/ibus-x11 --kill-daemon
 2621 ?        Sl     0:00 /usr/lib/ibus-m17n/ibus-engine-m17n --ibus
 2853 pts/0    S+     0:00 grep --color=auto ibus

(Ibus and it's language panel are visible).

3. Logout
4. Login (Ubuntu 2D)

(Language panel is not visible)

$ ps axw |grep ibus
 3046 ?        Sl     0:00 /usr/bin/ibus-daemon --xim
 3055 ?        Sl     0:00 /usr/lib/ibus/ibus-gconf
 3058 ?        Sl     0:00 /usr/bin/python /usr/share/ibus/ui/gtk/main.py
 3061 ?        Sl     0:00 /usr/lib/ibus/ibus-x11 --kill-daemon
 3092 ?        Sl     0:00 /usr/lib/ibus-m17n/ibus-engine-m17n --ibus
 3554 pts/0    S+     0:00 grep --color=auto ibus

$ lsb_release -d
Description:	Ubuntu 11.10
$ dpkg -l |grep ibus
ii  ibus                                          1.3.99.20110419-1ubuntu3                 Intelligent Input Bus - core
ii  ibus-gtk                                      1.3.99.20110419-1ubuntu3                 Intelligent Input Bus - GTK+2 support
ii  ibus-gtk3                                     1.3.99.20110419-1ubuntu3                 Intelligent Input Bus - GTK+3 support
ii  ibus-m17n                                     1.3.2-1ubuntu1                           m17n engine for IBus
ii  ibus-pinyin                                   1.3.99.20110706-1                        Pinyin engine for IBus
ii  ibus-pinyin-db-android                        1.3.99.20110706-1                        Pinyin engine for IBus - Android database
ii  ibus-pinyin-db-open-phrase                    1.3.99.20110706-1                        Pinyin engine for IBus - open-phrase database
ii  ibus-table                                    1.3.0.20100621-3ubuntu1                  table engine for IBus
ii  libibus-1.0-0                                 1.3.99.20110419-1ubuntu3                 Intelligent Input Bus - shared library
rc  libibus1                                      1.2.0.20091215-1ubuntu4                  New input method framework using dbus
rc  libibus2                                      1.3.9-2ubuntu2                           New input method framework using dbus
ii  libusb-0.1-4                                  2:0.1.12-18                              userspace USB programming library
ii  libusb-1.0-0                                  2:1.0.8-4                                userspace USB programming library
ii  libusb-dev                                    2:0.1.12-18                              userspace USB programming library development files
ii  libusbmuxd1                                   1.0.7-1                                  USB multiplexor daemon for iPhone and iPod Touch devices - library
rc  libusplash0                                   0.5.52                                   userspace bootsplash library
ii  pinyin-database                               1.2.99-3                                 PinYin database used by ibus-pinyin
ii  python-ibus                                   1.3.99.20110419-1ubuntu3                 Intelligent Input Bus - Python support