After today's update ubuntu became 2d despite the fact that I logged in under "ubuntu" not "ubuntu 2d". Also some other issues appeared (e.g. my shortcuts rolled back, num pad doesn't work, caps lock key don't have any effect on case, when I'm typing in dash - it doubles every letter - 'n' --> 'nn' )

Here is update log:

Setting up google-chrome-stable (17.0.963.83-r127885) ...
Setting up libavutil51 (4:0.8.1-1~ppa1) ...
Setting up libpostproc52 (4:0.8.1-1~ppa1) ...
Setting up libswscale2 (4:0.8.1-1~ppa1) ...
Setting up libavcodec53 (4:0.8.1-1~ppa1) ...
Setting up libavformat53 (4:0.8.1-1~ppa1) ...
Setting up libbluray1 (1:0.2.2-1~ppa1) ...
Setting up libmp3lame0 (3.99.5+repack1-3~ppa1) ...
Setting up libx264-120 (2:0.120.2171+git01f7a33-3~ppa1) ...
Setting up libxvidcore4 (2:1.3.2-9~ppa1) ...
Setting up thunderbird (11.0+build1-0ubuntu0.11.10.1) ...
Installing new version of config file /etc/apport/blacklist.d/thunderbird ...
Setting up thunderbird-globalmenu (11.0+build1-0ubuntu0.11.10.1) ...
Setting up thunderbird-gnome-support (11.0+build1-0ubuntu0.11.10.1) ...
Setting up thunderbird-locale-en (1:11.0+build1-0ubuntu0.11.10.1) ...
Setting up thunderbird-locale-en-gb (1:11.0+build1-0ubuntu0.11.10.1) ...
Setting up thunderbird-locale-en-us (1:11.0+build1-0ubuntu0.11.10.1) ...
Setting up thunderbird-locale-ru (1:11.0+build1-0ubuntu0.11.10.1) ...
Setting up ubuntu-tweak (0.6.2-1~oneiric1) ...
Setting up xul-ext-calendar-timezones (1.3+build1-0ubuntu0.11.10.1) ...
Setting up xul-ext-lightning (1.3+build1-0ubuntu0.11.10.1) ...
Setting up xul-ext-gdata-provider (1.3+build1-0ubuntu0.11.10.1) ...

What can I do to find what cause of this problem? What additional information should I provide to help you help me?