prerm is in lzma 9.22-2ubuntu3.
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
if
test "$1" != upgrade ||
# downgrading to a pre-alternatives version
dpkg --compare-versions "$2" lt-nl 9.22-1
then
update-alternatives --remove lzma /usr/bin/lzmp
fi
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