Few days ago I converted one more 12.04 LTS host to Precise/Raring hybrid and my results were slightly different from my previous experience. Both systems were stable, no problems here, but I needed to install/update some additional packages, which were not required in the first case. So, my updated /etc/apt/preferences.d/libvirt
file contains additional lines:
Package: libtasn1-3 Pin: release a=raring Pin-Priority: 990 Package: qemu-kvm Pin: release a=raring Pin-Priority: 990 Package: qemu-common Pin: release a=raring Pin-Priority: 990
As for stability – it’s like I said – I have no complaints so far.