Little correction: the correct language packages for Croatian as a reference are here:
nebojsa@momcilo-desktop:~$ dpkg -l | grep -e "-hr" ii firefox-locale-hr 66.0.2+build1-0ubuntu0.18.04.1 amd64 Croatian language pack for Firefox ii gnome-getting-started-docs-hr 3.28.2-0ubuntu0.1 all Help a new user get started in GNOME (Croatian) ii gnome-user-docs-hr 3.28.2+git20180715-0ubuntu0.1 all GNOME user's guide (Croatian) ii hunspell-hr 1:6.0.3-3 all Croatian dictionary for hunspell ii hyphen-hr 1:6.0.3-3 all Croatian hyphenation patterns ii language-pack-gnome-hr 1:18.04+20180712 all GNOME translation updates for language Croatian ii language-pack-gnome-hr-base 1:18.04+20180712 all GNOME translations for language Croatian ii language-pack-hr 1:18.04+20180712 all translation updates for language Croatian ii language-pack-hr-base 1:18.04+20180712 all translations for language Croatian ii libreoffice-l10n-hr 1:6.0.7-0ubuntu0.18.04.2 all office productivity suite -- Croatian language package ii thunderbird-locale-hr 1:60.6.1+build2-0ubuntu0.18.04.1 amd64 Croatian language pack for Thunderbird -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1823778 Title: Unable to set Serbian as Language To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1823778/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs