[Koha] Upgrading from 3.14 to 3.20 (Oldstable)

[le-grex]

Hello,

well it's Christmas and i expected nobody to use Koha these days, so i
run a upgrade from a 3.14er Installation to 3.20 (from the oldstable
channel).

It looked like it all went well, but now, the Web-Installer
(Updatestructure) doesn't go away. If i login with the "Superuser" i get:

"All required Perl modules appear to be installed.
All dependencies installed."

I can click next and get:

"Updating database structure

Everything went OK, update done."

-> "Continue to log in to Koha"

But if i click that it shows the first (All required Perl...) window
again, this: cgi-bin/koha/installer/install.pl?step=1&op=updatestructure

The Log says:

[Sat Dec 26 17:20:06 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:06 2015] mainpage.pl: Database update needed, redirecting to
Installer. Database is 3.2007000 and Koha is 3.2007001 at
/usr/share/koha/lib/C4/Auth.pm line 697., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:06 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:06 2015] Context.pm: Subroutine C4::Context::confess redefined at
/usr/share/perl/5.14/Exporter.pm line 67., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:06 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:06 2015] Context.pm: Subroutine C4::Context::croak redefined at
/usr/share/perl/5.14/Exporter.pm line 67., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:06 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:06 2015] Context.pm: Subroutine C4::Context::carp redefined at
/usr/share/perl/5.14/Exporter.pm line 67., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:08 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:08 2015] install.pl: Use of uninitialized value $version in
numeric lt (<) at /usr/share/perl5/Modern/Perl.pm line 25., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:08 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:08 2015] install.pl: Use of uninitialized value $version in
numeric lt (<) at /usr/share/perl5/Modern/Perl.pm line 25., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=3&op=updatestructure&checkmodule=1
[Sat Dec 26 17:20:08 2015] [error] [client 109.104.55.175] File does not
exist: /usr/share/koha/intranet/htdocs/favicon.ico, referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=1&op=updatestructure
[Sat Dec 26 17:20:09 2015] [error] [client 109.104.55.175] [Sat Dec 26
17:20:09 2015] 404.pl: Database update needed, redirecting to Installer.
Database is 3.2007000 and Koha is 3.2007001 at
/usr/share/koha/lib/C4/Auth.pm line 697., referer:
https://koha.domain.de/cgi-bin/koha/installer/install.pl?step=1&op=updatestructure

3.2007001? The Upgrade didn't show that, i've seen only this:

Upgrade to 3.20.07.000 done (3.20.7 release)
/usr/share/koha/opac/htdocs/opac-tmpl/prog/en/: Input must be a directory.
(Symbolic links are not supported at the moment)
Try `/usr/share/koha/misc/translator/tmpl_process3.pl --help for more
information.
/usr/share/koha/opac/htdocs/opac-tmpl/ccsr/en/: Input must be a directory.
(Symbolic links are not supported at the moment)

The latter is from the opac themes ccsr and prog which aren't used
anymore, as far as i see.

But i don't get how to get this database to 3.2007001...

Maybe someone can help me with that.

Thank you and have some happy holidays though ;)

Ciao,

Grex