How to fix missing Virtual Machines after upgrading from 10.04 (Lucid) to 12.04 (Precise)? Are all your KVM virtual machines missing after upgrading between these two LTS releases? If so, check Ubuntu Bug #931350 for more information and how to fix the problem. Specifically, you can fix this issue by downloading and running the simple script provided by Peter Matulis in Comment #9. How to prevent