Moin Holger,

* Holger Levsen <hol...@layer-acht.org> [2025-03-31 13:03]:
$ unshare --map-user 0 --map-group 0 --map-users 100000,1,1 --map-groups 
100000,1,1 id
uid=0(root) gid=0(root) Gruppen=0(root),65534(nogroup)
$ newgrp sbuild
$ unshare --map-user 0 --map-group 0 --map-users 100000,1,1 --map-groups 
100000,1,1 id
newuidmap: Target process is owned by a different user: uid:1000 pw_uid:1000 
st_uid:1000, gid:114 pw_gid:1000 st_gid:114

I can reproduce this, so it is likely the `newgrp sbuild`. Can you try without?

Also, I assume you run newgrp because some command/documentation told you so? Can you say which one so we can update it?

Cheers Jochen

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