During updating the system to 4.13.2 I noticed that the programs started to open in English, instead of Spanish (wich is my first language). After restart, the hole system is in English, and although I have kde-l10n-es installed, using System Settings > Locale > Country/Region... > Languages I cannot load Spanish on Preferred Languages saying "You have the language with code 'es' in your list of languages to use for translation but the localization files for it could not be found. The language has been removed from your configuration. If you want to add it again please install the localization files for it and add the language again." and leaves me with only American English as the only option. I try to reinstal kde-l10n-es, with no luck. That's the first time I have this problem, and I could not find anyone with something similar.
I've forgotten to put what I've got when I tried to reinstall kde-l10-es $ sudo apt-get install --reinstall kde-l10n-es Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded. Need to get 0 B/22.8 MB of archives. After this operation, 0 B of additional disk space will be used. perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = "en", LC_ALL = (unset), LC_TIME = "en_MX.UTF-8", LC_MONETARY = "en_MX.UTF-8", LC_ADDRESS = "en_MX.UTF-8", LC_TELEPHONE = "en_MX.UTF-8", LC_NAME = "en_MX.UTF-8", LC_MEASUREMENT = "en_MX.UTF-8", LC_IDENTIFICATION = "en_MX.UTF-8", LC_NUMERIC = "en_MX.UTF-8", LC_PAPER = "en_MX.UTF-8", LANG = "en_MX.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory (Reading database ... 237852 files and directories currently installed.) Preparing to unpack .../kde-l10n-es_4%3a4.13.1-0ubuntu0.1~ubuntu14.04~ppa2_all.deb ... Unpacking kde-l10n-es (4:4.13.1-0ubuntu0.1~ubuntu14.04~ppa2) over (4:4.13.1-0ubuntu0.1~ubuntu14.04~ppa2) ... Processing triggers for man-db (2.6.7.1-1) ... locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory Setting up kde-l10n-es (4:4.13.1-0ubuntu0.1~ubuntu14.04~ppa2) ...
I must say that I was too quick to upgrade: the package kde-l10n-es was (wrongly) updated later than the other packages. At least by 30 minutes or so. After upgrading that package to 4.13.2, the problem disappeared.