Cygwin: Your group is currently…

I just updated my cygwin environment and started receiving following errors upon login to console:

Your group is currently "mkpasswd".  This indicates that your
gid is not in /etc/group and your uid is not in /etc/passwd.

The /etc/passwd (and possibly /etc/group) files should be rebuilt.
See the man pages for mkpasswd and mkgroup then, for example, run

mkpasswd -l [-d] > /etc/passwd
mkgroup  -l [-d] > /etc/group

Note that the -d switch is necessary for domain users.

There are actually three variations here – group is mkpasswd, passwd/group_GID_clash(gid/pgsid), or mkgroup

The test causing this is in your .profile:

# If this message keeps appearing and you are sure it's a mistake (ie, don't
#   email about it!), comment out the test below.
case "$(id -ng)" in
mkpasswd )
  echo "Your group is currently \"mkpasswd\".  This indicates that your"
  echo "gid is not in /etc/group and your uid is not in /etc/passwd."
  echo
  echo "The /etc/passwd (and possibly /etc/group) files should be rebuilt."
  echo "See the man pages for mkpasswd and mkgroup then, for example, run"
  echo
  echo "mkpasswd -l [-d] > /etc/passwd"
  echo "mkgroup  -l [-d] > /etc/group"
  echo
  echo "Note that the -d switch is necessary for domain users."
  ;;
passwd/group_GID_clash* )
  echo "Your group is currently \"passwd/group_GID_clash(gid/pgsid)\".  This"
  echo "indicates that your gid is not in /etc/group, but the pgsid (primary "
  echo "group associated with your SID) is in /etc/group."
  echo
  echo "The /etc/passwd (and possibly /etc/group) files should be rebuilt."
  echo "See the man pages for mkpasswd and mkgroup then, for example, run"
  echo
  echo "mkpasswd -l [-d] > /etc/passwd"
  echo "mkgroup  -l [-d] > /etc/group"
  echo
  echo "Note that the -d switch is necessary for domain users."
  ;;
mkgroup )
  echo "Your group is currently \"mkgroup\".  This indicates that neither"
  echo "your gid nor your pgsid (primary group associated with your SID)"
  echo "is in /etc/group."
  echo
  echo "The /etc/group (and possibly /etc/passwd) files should be rebuilt."
  echo "See the man pages for mkpasswd and mkgroup then, for example, run"
  echo
  echo "mkpasswd -l [-d] > /etc/passwd"
  echo "mkgroup  -l [-d] > /etc/group"
  echo
  echo "Note that the -d switch is necessary for domain users."
  ;;
esac

First, note the comments that start this block. Figure that out But to resolve the problem, most will just need to follow the directions by:

$ mkpasswd -l > /etc/passwd
$ mkgroup -l > /etc/group

However, this won’t work if you are in a domain. What the instructions would have you do is use the -d switch (print domain accounts with uid offset offset)
and dump however many groups are defined for your company. This could be dozens or hundreds or thousands, though. Nasty.

So rather than saying what you don’t want, say what you want with -c (print current user).

mkpasswd -c > /etc/passwd
mkgroup -c > /etc/group

That simply takes your own information and puts it in those files.