Comment 12 for bug 216358

Yeah, I began to realise I was wrong before reading you comment.

I have a new, I hope better hypothesis now.
It look a bit stupid, but maybe it is trying to become a deleted user.

For ZDS (original poster) it would have means he would have deleted the "nobody" user (normally nobody have
id 65534 in /etc/passwd, but I remember a time where I was deleting it for feeling my system more secure.
Maybe even the user nogroup in /etc/group.

For Berni, it would be not having a group 1001 in /etc/group
Based on "Failed to set uid privileges to (-1,1001) now set to (0,0)" info.
Try to look if "sudo /etc/group | grep 1001" returns something.