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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 ?

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  • I find it a known bug in updating 14.10 to 15.04 because I find an error message at the boot: 'starting build 219' on screen. it's recommend to go to console mode and enter this command: cat /etc/X11/default-display-manager It display manager is /usr/sbin/lightdm, then running the following sudo systemctl enable gdm.service -f but now it stay at the login
    – tinyork
    May 22, 2015 at 21:06

1 Answer 1

Reset to default
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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
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  • I tried it just now ,but it doesn't work. Still in ‘starting version 219’ and into the cycle.
    – tinyork
    May 22, 2015 at 23:34
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    Try boot with the option --- upstart
    – kyodake
    May 23, 2015 at 0:37
  • With upstart works but how to make as default? why dont start without upstart?
    – momo2047
    Nov 8, 2015 at 17:50

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