Public bug reported:
I installed 12.04.2 using a LiveCD on my desktop with secure boot enabled.
This machine is about 5 months old and came with
Windows 8 installed.
The installation went smoothly. Rebooting Windows 8 from the Grub menu
worked fine, but I couldn't reboot from the Grub "Ubuntu" menu item even
after running boot-repair a couple of times.
Selecting the "Advanced options for Ubuntu" had menu items for booting 3
different kernels. By trial and error I found
that one, the oldest kernel, would boot while the others locked the system and
required a power down.
Examining the vmlinuz files in the /boot directory I discovered that the kernel
I was able to boot was the only one that was signed.
Since the other unsigned kernels were higher numbered, Grub naturally selected
one of them to boot with and that caused the
failures. Updating the kernels with their signed versions eliminated all the
boot problems.
The install was done with updating selected and that may have
contributed to the problem of installing unsigned kernels. There should
be some way to insure that no unsigned kernels are installed, especially
ones with the highest version number.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1155472
Title:
problem secure booting 12.04.2 after installation
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