This package has some nifty tools (specifically 'guestfish') which will help us troubleshoot broken VMs. It has an absurd dependency tree though.
root@cloudvirt1024:~# apt-get install libguestfs Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package libguestfs root@cloudvirt1024:~# apt-get install libguestfs-tools Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: acl attr btrfs-progs btrfs-tools cryptsetup cryptsetup-bin db-util db5.3-util dosfstools extlinux fuse genisoimage icoutils ldmtool libafflib0v5 libbfio1 libconfig9 libdate-manip-perl libencode-locale-perl libewf2 libfile-listing-perl libguestfs-perl libguestfs0 libhivex0 libhtml-parser-perl libhtml-tagset-perl libhtml-tree-perl libhttp-cookies-perl libhttp-date-perl libhttp-message-perl libhttp-negotiate-perl libintl-perl libio-html-perl libio-socket-ssl-perl libjson-glib-1.0-0 libjson-glib-1.0-common libldm-1.0-0 liblwp-mediatypes-perl liblwp-protocol-https-perl liblzo2-2 libnet-http-perl libnet-ssleay-perl libnetpbm10 libntfs-3g871 libstring-shellquote-perl libsys-virt-perl libtimedate-perl libtsk13 liburi-perl libwin-hivex-perl libwww-perl libwww-robotrules-perl libxml-parser-perl libxml-xpath-perl lsscsi lzop mdadm mtools netpbm ntfs-3g perl-openssl-defaults scrub sgabios sleuthkit supermin syslinux zerofree