Recently, I tried installing Ubuntu on my friend’s computer. I used Maverick’s Live CD but the boot process stuck at kernel_thread_helper+0x7/0x10. I noticed a huge list of acpi errors above this message and figured it was somehow related to ACPI. To solve the problem I simply turned of ACPI.
Solving the problem in Live CD:
Insert live cd, and before the Ubuntu tries to boot into it press Esc repeatedly until you get to Ubuntu menu. Press F6 and select acpi=off and press enter. You can now press Esc again to close this sub-menu and press ‘Enter’ to boot into Live CD. This time your boot process should complete without any errors.
Solving the problem in installed system:
(Once you install Ubuntu using Live CD, you have to follow the following steps to fix this problem in your installation.)
- In the grub menu, press ‘e’. Search for ‘quiet splash’ and add ‘acpi=off’ (without quotes) after that to make it look like ‘quiet splash acpi=off’. You’ll be able to boot in now.
- Go to Applications->Accessories->Terminal
sudo gedit /etc/default/grub
- Find the line which says GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash” and change it to the following:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi=off”
- Exit gedit.
- Restart. This time you don’t have to edit anything. Ubuntu should boot without any issues.
Comments and suggestions are more than welcome.