Hello I encountered on my x2go when trying to remote the ubuntu server
**Connection Failed.** perl:warning: Setting locale failed. perl:warning Please check that your locale settings: LANGUAGE = "en_US", LC_ALL = (unset), LANG = "en_GB.UTF-8" are supported and installed on your machine system. Falling back to the standard locale ("C").
Best Answer
Apply this to your host(connected to) machine:
To resolve this warning or install new install with local-gen data localizations of default which in this case are precisely en_US.UTF8 .
To install / reinstall well as en_US.UTF-8 :
Then apply the changes with dpkg-reconfigure locales
Then
Now try to connect again