Every once in a while, I see the Software Update icon show up in the Unity Dock. I try to stay on top of keeping the system up to date. This time around, it asked to reboot my laptop. I let it reboot, since reboots are pretty quick. To my surprise, X didn't start up after the reboot! This is the type of thing that got me fed up with Gentoo as a desktop/laptop distro. Ubuntu isn't supposed to run into these types of problems. I got on my desktop and started googling. I read about various reports of the "Lightdm" app not working. I decided to switch to VT1 and check on what is going on. Eventually, I discovered that killing 'X' would force Lightdm to load.
root 1157 1113 3 13:47 tty7 00:00:00 /usr/bin/X :0 -core -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
For a long term fix, most people just suggested switching to GDM. GDM is what I used in Gentoo, so I decided to switch to it. Most instructions told me to uninstall Lightdm first. When I ran
apt-get remove lightdm
I got a message telling me that it would uninstall 'ubuntu-desktop' as well. That isn't what I wanted. I decided to install GDM without uninstalling lightdm. When I ran
apt-get install gdm
I got an Ncurses interface that let me select with display manager would be used. After selecting GDM and rebooting, my laptop was usable again.
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