Can't start Ubuntu - Package power limit notification

Solution 1:

Note:

• Power Limit Notification is a feature that was added to the Sandy Bridge processors from Intel. The notification does not indicate a problem, and should not be reported as a Critical-level message.
• The occurrence of the power limit notification is routine, and the system should not be reporting the messages. They can be ignored.

source: Linux - "Package Power limit" and "Core power limit" notifications.

Possible solutions are:

• Upgrade kernel (or downgrade if upgrade not possible)
• Clear PLN flag by adding clearcpuid=229 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub then sudo update-grub
• Set the machine's Performance Profile to Max Performance in the BIOS, if that setting is available

References:

• Linux - "Package Power limit" and "Core power limit" notifications
• Kernel 3.6.2 Power Regressions (Sandy Bridge)