Hi,
thank you for your report and your help to make Ubuntu better.
I tried to recreate:
$ apt install postgresql
$ dpkg -S /usr/share/postgresql/9.6/man/man1/postmaster.1.gz
postgresql-9.6: /usr/share/postgresql/9.6/man/man1/postmaster.1.gz
$ apt remove postgresql
And I see:
Removing postgresql-contrib-9.6 (9.6.3-0ubuntu0.17.04) ...
update-alternatives: warning: forcing reinstallation of alternative
/usr/share/postgresql/9.6/man/man1/postmaster.1.gz because link group
postmaster.1.gz is broken
So both our cases have that file missing, yet in my repro-case dpkg
detects that and removes it correctly.
The file itself is a very old compat name:
update-alternatives: using /usr/share/postgresql/9.6/man/man1/postmaster.1.gz
to provide /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode
Quoting from that:
"postmaster is a deprecated alias of postgres."
So in your case something seems to break that - but I can't see from the logs
what :-/
Could you report back what the following shows you:
$ dpkg -S /usr/share/postgresql/9.6/man/man1/postmaster.1*
$ ls -laF /usr/share/postgresql/9.6/man/man1/postmaster.1*
Maybe we find some sort of half installed or half removed file that causes this.
Other than that I wanted to ask if you have any sort of third party packages
installed that could cause this?
** Changed in: postgresql-9.6 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1697675
Title:
package postgresql-contrib-9.6 9.6.3-0ubuntu0.17.04 failed to
install/upgrade: subprocess installed pre-removal script returned
error exit status 2
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