prerm is in google-compute-engine-oslogin 20180129+dfsg1-0ubuntu3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
set -e
# In version 20170718-0ubuntu1 prerm disabled OS Login but the package did not
# depend on openssh-server and missing openssh-server made disabling OS Login
# and as a result prerm fail. Upon upgrading google-compute-engine-oslogin dpkg
# tried to fall back to running the new version's prerm but it failed since it
# was missing. (LP: #1733878)
# This minimal prerm just exits with success making upgrading from
# 20170718-0ubuntu1 and older releases succeed.
exit 0
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