So I see
Setting up ca-certificates (20180409) ...
Updating certificates in /etc/ssl/certs...
rehash: error: skipping dovecot.pem, cannot open file
rehash: warning: skipping duplicate certificate in AlphaSSL_root.crt
dpkg: error processing package ca-certificates (--configure):
installed ca-certificates package post-installation script subprocess
returned error exit status 1
and I can tell you that (back in 2015) I did run
wget -O /etc/ssl/certs/AlphaSSL_root.crt
https://www.alphassl.com/support/roots/root.txt
when I was trying to make my dovecot use a wildcard certificate bought
from AlphaSSL.
Seems a bit harsh to fail the entire OS upgrade because I downloaded an
extra file into /etc/ssl/certs/.
Meanwhile dpkg --configure -a that do-release-upgrade ran for me
completed without errors and apt upgrade shows no packages needing
upgrades (just a bunch expecting autoremovals).
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https://bugs.launchpad.net/bugs/1843607
Title:
package ca-certificates 20180409 failed to install/upgrade: installed
ca-certificates package post-installation script subprocess returned
error exit status 1
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