prerm is in upx-ucl 3.91-4.
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 | #!/bin/sh
#
set -e
[ "$1" = "remove" ] && update-alternatives --remove upx /usr/bin/upx-ucl
exit 0
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