root@mantitz:/home/mantitz# sudo apt install koha-common Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: galera-3 libconfig-inifiles-perl libreadline5 Use 'sudo apt autoremove' to remove them. Suggested packages: letsencrypt The following NEW packages will be installed: koha-common 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 41.2 MB of archives. After this operation, 566 MB of additional disk space will be used. Get:1 http://debian.koha-community.org/koha stable/main amd64 koha-common all 21.05.04-1 [41.2 MB] Fetched 41.2 MB in 32s (1,288 kB/s) Preconfiguring packages ... Selecting previously unselected package koha-common. (Reading database ... 198769 files and directories currently installed.) Preparing to unpack .../koha-common_21.05.04-1_all.deb ... Unpacking koha-common (21.05.04-1) ... Setting up koha-common (21.05.04-1) ... Upgrading database schema for library DBIx::Class::Storage::DBI::catch {...} (): DBI Connection failed: DBI connect('d atabase=koha_library;host=localhost;port=3306','koha_library',...) failed: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1517. at /usr/share/koha/lib/ Koha/Database.pm line 109 dpkg: error processing package koha-common (--configure): installed koha-common package post-installation script subprocess returned erro r exit status 2 Processing triggers for man-db (2.9.1-1) ... Processing triggers for systemd (245.4-4ubuntu3.13) ... Errors were encountered while processing: koha-common E: Sub-process /usr/bin/dpkg returned an error code (1) root@mantitz:/home/mantitz#