Why roundcube is not installed in /usr/share/php/roundcube ?

What is the output of:

lsb_release -a; uname -a; apt-cache policy roundcube

Thanks

In fact the symlinks cause many more problems here. Should I now add all these to open_basedir? Seems very unsafe to me. I had hoped that with the package manager it would be easy. I might as well manually install en upgrade then:

Warning: realpath(): open_basedir restriction in effect. File(/etc/roundcube/defaults.inc.php) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 350

Warning: realpath(): open_basedir restriction in effect. File(/etc/roundcube/config.inc.php) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 350

Warning: realpath(): open_basedir restriction in effect. File(/var/lib) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 236

Warning: realpath(): open_basedir restriction in effect. File(/var/log/roundcube) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 236

Warning: realpath(): open_basedir restriction in effect. File(/var/lib) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 236

Warning: realpath(): open_basedir restriction in effect. File(/var/lib/roundcube/temp) is not within the allowed path(s): (/var/www/admin/htdocs/:/var/www/admin/apps/:/var/www/admin/priv/:/var/www/admin/tmp/:/usr/share/pear/:/usr/share/php/:/usr/share/roundcube) in /usr/share/roundcube/program/lib/Roundcube/rcube_config.php on line 236

# lsb_release -a; uname -a; apt-cache policy roundcube
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
Linux zibamrakez 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
roundcube:
  Installed: 1.3.6+dfsg.1-1
  Candidate: 1.3.6+dfsg.1-1
  Version table:
 *** 1.3.6+dfsg.1-1 500
        500 http://mirror.hetzner.de/ubuntu/packages bionic/universe amd64 Packages
        500 http://mirror.hetzner.de/ubuntu/packages bionic/universe i386 Packages
        100 /var/lib/dpkg/status

This seems to be similar
https://support.plesk.com/hc/en-us/articles/115000278993-A-website-hosted-in-Plesk-is-not-accessible-open-basedir-restriction-in-effect-File-is-not-within-the-allowed-path-s-

Looks like some file needs editting. Its not something I use and you may want to post on a Roundcube forum

There is another bug. In the end I added all missing folders to open_basedir , but then I received a message that the config.inc.php was not found, while I saw it was there. I reran the package configuration but that did not help. I gave up on it and resort to manual installation and upgrade. Thanks for your efforts though.