postrm is in python3-diskimage-builder 2.11.0-0ubuntu1.
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 | #!/bin/sh
set -e
if [ "$1" = "remove" ] || [ "$1" = "disappear" ] ; then
update-alternatives --remove dib-block-device /usr/bin/python3-dib-block-device
update-alternatives --remove dib-lint /usr/bin/python3-dib-lint
update-alternatives --remove disk-image-create /usr/bin/python3-disk-image-create
update-alternatives --remove element-info /usr/bin/python3-element-info
update-alternatives --remove ramdisk-image-create /usr/bin/python3-ramdisk-image-create
fi
exit 0
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