postinst is in ubuntu-keyring 2018.02.28.
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 15 16 17 | #!/bin/sh
set -e
if [ "$1" = 'configure' -a -n "$2" ]; then
# remove keys from the trusted.gpg file as they are now shipped in fragment files in trusted.gpg.d
if dpkg --compare-versions "$2" 'lt' "2016.09.19" && which gpg > /dev/null && which apt-key > /dev/null; then
TRUSTEDFILE='/etc/apt/trusted.gpg'
eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
if [ -e "$TRUSTEDFILE" ]; then
for KEY in 40976EAF437D05B5 46181433FBB75451 3B4FE6ACC0B21F32 D94AA3F0EFE21092; do
apt-key --keyring "$TRUSTEDFILE" del $KEY > /dev/null 2>&1 || :
done
fi
fi
fi
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