this is now https://gitlab.com/codelibre/schroot/merge_requests/20 and was merged to master two years ago.
However, this still doesn't fix the issue I face when entering a schroot of main system, with /etc/resolv.conf -> /run/NetworkManager/resolv.conf $ schroot -c thinkpad -u root E: 20copyfiles: realpath: /run/schroot/mount/thinkpad-7b8f67af-f952-4f84-be1d-07ef66e9249a/run/NetworkManager/resolv.conf: No such file or directory E: 20copyfiles: cp: cannot create regular file '': No such file or directory E: thinkpad-7b8f67af-f952-4f84-be1d-07ef66e9249a: Chroot setup failed: stage=setup-start BTW without that patch, it looks like this: $ schroot -c thinkpad -u root E: 20copyfiles: cp: '/etc/resolv.conf' and '/var/run/schroot/mount/thinkpad-fe82a8ce-cf15-4cbb-928c-dfabea3eebbd/etc/resolv.conf' are the same file E: thinkpad-fe82a8ce-cf15-4cbb-928c-dfabea3eebbd: Chroot setup failed: stage=setup-start