exit code 2 from /etc/preremove/python39-pip.sh

[Fergus Daly]

I don't think it matters much (or at all*) but while installing today's python39 update I got:
      running: .. .. \bin\bash.exe --norc --noprofile "/etc/preremove/python39-pip.sh"
      abnormal exit: exit code=2
On inspection the .sh file contains the single command:
      /usr/sbin/alternatives --remove pip3 /usr/bin/pip3.9
This syntax with arguments and switches is duplicated frequently in /etc/preremove/ scripts
so I cannot quite see where the problem resides .. ..
Fergus
(*) Nothing seems to be broken.