chroot from older GNU/Linux

[kalpana]

Lately I installed a couple Ubuntu variants on my PC because I administer them for users. Personally I've always used the oldest GNU/Linux, so I want to chroot in. When I do so, it says the following.

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groups: cannot find name for group ID 17
groups: cannot find name for group ID 215
I didn't see those in /etc/group, so what does this mean? Other than this, the chroot seems to work well, including updates, apt, etc. Do the error messages mean anything else needs to be configured for things to work right? Of course, the OS I chroot from doesn't have systemd.