Seems like it is more and more difficult to upgrade Ubuntu (especially if you do not want to use Unity or Gnome Shell).
Last weekend I was to update 4 computers to new Ubuntu 11.10
- netbook (Asus EeePC 1000H) – no problems
- HP Laptop – no problem
- PC – problem with new kernel (did not install)
- HTPC – problem with display manager (lightdm did not install, gdm stopped working)
On all computers (except for HTPC) I have switched from Gnome 2 to Xfce (not to get trapped in Unity or Gnome Shell after upgrade).
Kernel problem (nvidia drivers)
After PC upgrade, I have rebooted and new Ubuntu started. For some reasons it used old kernel 2.6.38 . I do not know why new kernel 3.0.0 was not upgraded and installed. I decided to install new kernel vith synaptic, which went smoothly. After reboot, X-Window did not start (even in recovery session). Luckily, I was able to get to the command prompt with networking enabled. The fix was to un-install Nvidia driver, install new kernel headers and install Nvidia driver back.
apt-get remove nvidia-current nvidia-settings apt-get install linux-headers-3.0.0-12-generic apt-get install nvidia-current nvidia-settings
After that, Ubuntu started OK.
After HTPC upgrade, I have rebooted and found the X-Window did not start (again!). Luckily, I was able to get into command prompt. Reinstalling Nvidia driver (like in previous case) did not help. After some investigation I was able to start X-Window with startx command. I have installed lightdm, rebooted and everything was OK.
Looking forward to 12.04 :-).