I upgraded Ubuntu14.10 to 15.04, using software updater.
After finished it , I restart.
Now on a restart it fails to make it to the login prompt. The system looks to be in a cycle of failure and I see the message repeatedly.
[ok] started light display manager.
[ok] start ACPI event Damon.
Starting ACPI event damon ...
Then it back to login , cycle to login, ACPI event ...
Does it means something wrong with ACPI?
I don't how to deal with it. I can only boot in recovery mode. What can I do ?
1 Answer
Test this:
Switch on your computer.
Press and hold the Shift key, which will bring up the Grub menu.
Select the line which starts with ---- Advanced options
.
Select the line ending with ---- recovery mode
.
In the menu with a number of options, select ---- Drop to root shell prompt
.
In the terminal, run the commands:
mount -o remount,rw /
mount --all
dpkg --configure -a
apt-get -f install
apt-get -m install
apt-get update
apt-get dist-upgrade
apt-get autoremove
apt-get install --reinstall ubuntu-desktop
apt-get clean
reboot
cat /etc/X11/default-display-manager
It display manager is /usr/sbin/lightdm, then running the followingsudo systemctl enable gdm.service -f
but now it stay at the login