Comment 99 for bug 330824

Documented at <https://wiki.ubuntu.com/JauntyJackalope/ReleaseNotes#Lock-ups when deleting files from ext4 filesystems>:

In some cases, deleting files from an ext4 filesystem is reported to cause soft lock-ups in the kernel. Investigation of this problem is ongoing, and it is expected that a fix for this problem will be made available as a post-release update. To avoid this problem, users may wish to install using the default ext3 filesystem and convert their filesystem to ext4 (as documented on the ext4 wiki) once a fix is available.