I had the same problem and fixed it with following (replace de with fi for your problem)
# update-locale LANG=de_DE.UTF-8 perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_PAPER = "de_AT.UTF-8", LC_ADDRESS = "de_AT.UTF-8", LC_MONETARY = "de_AT.UTF-8", LC_NUMERIC = "de_AT.UTF-8", LC_TELEPHONE = "de_AT.UTF-8", LC_MEASUREMENT = "de_AT.UTF-8", LC_TIME = "de_AT.UTF-8", LC_NAME = "de_AT.UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). *** update-locale: Error: invalid locale settings: LANG=de_DE.UTF-8 root@rz1-prefirewall-s:~# sudo locale-gen de_DE Generating locales... de_DE.ISO-8859-1... done Generation complete. root@rz1-prefirewall-s:~# update-locale LANG=de_DE.UTF-8 perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_PAPER = "de_AT.UTF-8", LC_ADDRESS = "de_AT.UTF-8", LC_MONETARY = "de_AT.UTF-8", LC_NUMERIC = "de_AT.UTF-8", LC_TELEPHONE = "de_AT.UTF-8", LC_MEASUREMENT = "de_AT.UTF-8", LC_TIME = "de_AT.UTF-8", LC_NAME = "de_AT.UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). *** update-locale: Error: invalid locale settings: LANG=de_DE.UTF-8 # apt-get install language-pack-de Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: firefox-locale-de language-pack-de-base The following NEW packages will be installed: firefox-locale-de language-pack-de language-pack-de-base 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 3388 kB of archives. After this operation, 11.3 MB of additional disk space will be used. Do you want to continue [Y/n]? Get:1 http://at.archive.ubuntu.com/ubuntu/ precise/main language-pack-de-base all 1:12.04+20120417 [3144 kB] Get:2 http://at.archive.ubuntu.com/ubuntu/ precise/main language-pack-de all 1:12.04+20120417 [1982 B] Get:3 http://at.archive.ubuntu.com/ubuntu/ precise-updates/main firefox-locale-de i386 12.0+build1-0ubuntu0.12.04.1 [241 kB] Fetched 3388 kB in 1s (2194 kB/s) perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_TIME = "de_AT.UTF-8", LC_MONETARY = "de_AT.UTF-8", LC_ADDRESS = "de_AT.UTF-8", LC_TELEPHONE = "de_AT.UTF-8", LC_NAME = "de_AT.UTF-8", LC_MEASUREMENT = "de_AT.UTF-8", LC_NUMERIC = "de_AT.UTF-8", LC_PAPER = "de_AT.UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_ALL to default locale: No such file or directory Selecting previously unselected package language-pack-de-base. (Reading database ... 106525 files and directories currently installed.) Unpacking language-pack-de-base (from .../language-pack-de-base_1%3a12.04+20120417_all.deb) ... Selecting previously unselected package language-pack-de. Unpacking language-pack-de (from .../language-pack-de_1%3a12.04+20120417_all.deb) ... Selecting previously unselected package firefox-locale-de. Unpacking firefox-locale-de (from .../firefox-locale-de_12.0+build1-0ubuntu0.12.04.1_i386.deb) ... Setting up firefox-locale-de (12.0+build1-0ubuntu0.12.04.1) ... Setting up language-pack-de (1:12.04+20120417) ... Setting up language-pack-de-base (1:12.04+20120417) ... Generating locales... de_AT.UTF-8... done de_BE.UTF-8... done de_CH.UTF-8... done de_DE.UTF-8... done de_LI.UTF-8... done de_LU.UTF-8... done Generation complete. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/928878 Title: Lucid to Precise: cannot set locale: file not found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/langpack-locales/+bug/928878/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs