Comment 14 for bug 1832757

addendum for test 2:
# diff -uNr /tank/trusty-2{a,b}/ 2>/dev/null|diffstat
 root/.bash_history | 2
 var/cache/apt/archives/ubuntu-advantage-tools_10ubuntu0.14.04.4_all.deb |binary
 var/cache/apt/pkgcache.bin |binary
 var/cache/ldconfig/aux-cache |binary
 var/lib/apt/extended_states | 24
 var/lib/dpkg/available | 46
 var/lib/dpkg/available-old | 601 ---------
 var/lib/dpkg/status-old | 105 -
 var/log/apt/history.log | 12
 var/log/apt/term.log | 7
 var/log/dpkg.log | 639 ++++------
 11 files changed, 409 insertions(+), 1027 deletions(-)

2>/dev/null was added because of broken absolute symlinks, which are only fine inside the chroot, but not from the outside. Full list at https://paste.ubuntu.com/p/sMmzYRrJT9/