Comment 15 for bug 1276739

This bug appears to be a problem with Xubuntu AMD64 12.04.4 Alternate.

I have been prevented using this disk to rescue an encrypted LVM system because, it says, "reload ioctl failed...failed to setup dm-crypt key mapping for device... check that kernel supports aes-xts-plain64 cipher".

The system was setup using default Xubuntu installer options for encrypted LVM (can't remember which version but it was recent and it worked).

The rescue has become necessary because kernel -29 update failed due to /root partition becoming full. Kernel update failure consisted of a disk full error before the kernel extras image could be installed. USB Keyboard therefore fails when system asks for encryption password.

The problem would be resolved for common users if the system detected its problem and provided a 'Dummy's' option to resize the partition, with an intelligent guess proffered as the new size.

Rescue of this situation is like venturing into a foggy swamp. Before you even get to attempt the resize operation, the Xubuntu rescue disk is not loaded with the same cipher that it had originally used to setup the encrypted volume.

The DebianLive AMD64 7.5.0 Rescue CD failed as well. It seems to be incapable of recognizing a non-US keyboard, which makes entering an encryption password setup on an English keyboard quite unlikely (unless its a Mickey Mouse password that uses only standard numbers and letters). It is very unlikely a common user will detect this fact from using the live CD. The experience of attempting this operation will therefore be deeply frustrating and ultimately unsuccessful.

The solution now appears to be to keep downloading rescue disks until one works.