I'm using ubuntu 14.04 and I'm not able to shut down or reboot my laptop. After pressing the reboot/shutdown button it just shows the purple screen & 5 dots. I'm not able to understand where the problem is.
try this one 1st reset unity & ubuntu desktop
$ sudo apt-get update $ sudo apt-get install --reinstall ubuntu-desktop $ sudo apt-get install unity $ setsid unity
if this didnt work
$ gksu "gedit /etc/default/grub"
change this line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"
save then update grub by typ
$ sudo grub-update
I had the same problem on Ubuntu 14.04.2 LTS, and finally after many, many hours of searching and experimenting I think I have a solution at least for the class of netbooks/laptops supporting UEFI boot mode (my laptop is ACER TravelMate B115):
In BIOS, under Boot, change Boot Mode to UEFI (after installing Ubuntu in Legacy mode).
This solution does not not require changing grub configuration file
/etc/default/grub (by adding
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"), which was questionable in 1st place anyway.
In my investigation I tried:
- installing Ubuntu 14.04.2 LTS from scratch
- updating Ubuntu to use latest
- changing grub parameters
- upgrading to Ubuntu 15.04
- upgrading BIOS to the latest for TravelMate B115 (V122 to V126)
- analysing the syslog