In #269573, the bug submitter complains that he cannot remove the bash package, because its prerm script calls.....remove-shell, which is a shell script. Indeed, as bash is then the last remaining shell, we enter a nice loop.
Matthias Klose finally suggested the only safe solution to this :
recode the two utilities {add|remove}-shell in C (or Perl).
Anyone wanting to try?
If no-one volunteers, we will tag this bug wontfix.
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