I think that the problem somehow involves perl being upgraded from 5.22.1 to 5.26 but 5.22.1 still being used when the trigger for doc-base is invoked.
From the dpkg terminal log:
<snip>
Preparing to unpack .../perl_5.26.1-6ubuntu0.3_amd64.deb ...
Unpacking perl (5.26.1-6ubuntu0.3) over (5.22.1-9ubuntu0.6) ...
Selecting previously unselected package perl-modules-5.26.
Preparing to unpack .../perl-modules-5.26_5.26.1-6ubuntu0.3_all.deb ...
Unpacking perl-modules-5.26 (5.26.1-6ubuntu0.3) ...
<snip>
Processing triggers for doc-base (0.10.7) ...
Database error: Cannot read file `/var/lib/doc-base/info/status.yml': Can't locate PerlIO.pm in @INC (you may need to install the PerlIO module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/share/perl/5.22.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.22 /usr/share/perl/5.22 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base .) at /usr/share/perl5/YAML/Tiny.pm line 183.
BEGIN failed--compilation aborted.
<snip>
Note that despite the fact that perl 5.22.1 has been replaced with perl 5.26, @INC still contains /usr/share/perl/5.22.1/ .
I have made a pre-upgrade btrfs snapshot. I plan to revert to it then uninstall doc-base and re-run the upgrade, then re-install doc-base. I plan to keep the snapshot if any developer would like me to test upgrade again with a fixed package.
I think that the problem somehow involves perl being upgraded from 5.22.1 to 5.26 but 5.22.1 still being used when the trigger for doc-base is invoked.
From the dpkg terminal log:
<snip>
Preparing to unpack .../perl_ 5.26.1- 6ubuntu0. 3_amd64. deb ... modules- 5.26_5. 26.1-6ubuntu0. 3_all.deb ...
Unpacking perl (5.26.1-6ubuntu0.3) over (5.22.1-9ubuntu0.6) ...
Selecting previously unselected package perl-modules-5.26.
Preparing to unpack .../perl-
Unpacking perl-modules-5.26 (5.26.1-6ubuntu0.3) ...
<snip>
Processing triggers for doc-base (0.10.7) ... doc-base/ info/status. yml': Can't locate PerlIO.pm in @INC (you may need to install the PerlIO module) (@INC contains: /etc/perl /usr/local/ lib/x86_ 64-linux- gnu/perl/ 5.22.1 /usr/local/ share/perl/ 5.22.1 /usr/lib/ x86_64- linux-gnu/ perl5/5. 22 /usr/share/perl5 /usr/lib/ x86_64- linux-gnu/ perl/5. 22 /usr/share/ perl/5. 22 /usr/local/ lib/site_ perl /usr/lib/ x86_64- linux-gnu/ perl-base .) at /usr/share/ perl5/YAML/ Tiny.pm line 183.
Database error: Cannot read file `/var/lib/
BEGIN failed--compilation aborted.
<snip>
Note that despite the fact that perl 5.22.1 has been replaced with perl 5.26, @INC still contains /usr/share/ perl/5. 22.1/ .
I have made a pre-upgrade btrfs snapshot. I plan to revert to it then uninstall doc-base and re-run the upgrade, then re-install doc-base. I plan to keep the snapshot if any developer would like me to test upgrade again with a fixed package.