Hello, I could still reproduce this issue with alpha3 with out running any test suite as shuch, but by just updgrading the os using 'apt-get dist- upgrade' and reboot will make the guest file system read-only.
uname -r 3.13.0-12-generic user@spartan:~$ mount /dev/vda2 on / type ext4 (rw,errors=remount-ro) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/cgroup type tmpfs (rw) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) udev on /dev type devtmpfs (rw,mode=0755) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755) none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880) none on /run/shm type tmpfs (rw,nosuid,nodev) none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755) none on /sys/fs/pstore type pstore (rw) systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd) mount: warning: /etc/mtab is not writable (e.g. read-only filesystem). It's possible that information reported by mount(8) is not up to date. For actual information about system mount points check the /proc/mounts file. few error messages after reboot in dmesg logs: ient.action" pid=580 comm="apparmor_parser" [ 10.271893] init: dmesg main process (604) terminated with status 7 [ 10.462209] init: plymouth-stop pre-start process (671) terminated with status 1 [ 107.678395] random: nonblocking pool is initialized [ 305.126848] EXT4-fs (vda2): error count: 48 [ 305.126859] EXT4-fs (vda2): initial error at 1393635308: htree_dirblock_to_tree:920: inode 4590544: block 18359106 [ 305.126865] EXT4-fs (vda2): last error at 1393825896: ext4_remount:4813: inode 4590473: block 18359087 Please have a look, and let me know if you need more details Thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267712 Title: ubuntu guest's file system becoming read only To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1267712/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs