prerm is in kinput2-canna-wnn 3.1-13build1.
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 | #!/bin/sh
set -e
update-alternatives --remove kinput2 /usr/bin/kinput2-canna-wnn
update-alternatives --remove xinput-ja_JP /etc/X11/xinit/xinput.d/kinput2-canna-wnn_canna
update-alternatives --remove xinput-ja_JP /etc/X11/xinit/xinput.d/kinput2-canna-wnn_wnn
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