preinst is in xemacs21-mule-canna-wnn 21.4.22-4ubuntu3.
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 | #!/bin/sh -e
set -e
# update-alternatives --auto xemacs21
# echo 'I apologize if I\'ve just blown away a site setup alternative.'
# echo 'But due to problems in previous xemacs21 packages this seems'
# echo 'like the only solution.'
update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-mule
update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-nomule
update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-mule-canna-wnn
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