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X11 for macOS as a server of remote Ubuntu 14.04

Recently the 13″ MBPr got upgrade to macOS Sierra 10.12. If I want to let it can act as remote X11 server of Ubuntu 14.04 (my main working VM in intranet), I have to install a X.Org X Window System that runs on macOS.

XQuartz is for this purpose , see

Then the file /etc/ssh/sshd_conf needs to be modified, and the ssh service needs up. After ssh to Ubuntu, there are some error/warning messages:

Last login: Thu Oct  6 14:32:12 2016 from
manpath: can't set the locale; make sure $LC_* and $LANG are correct
linkirin@trusty:~$ gvim
Fontconfig warning: ignoring UTF-8: not a valid region tag

To fix these, add two more lines in the file:

linkirin@trusty:~$ cat /etc/default/locale

linkirin@trusty:~$ cat /etc/default/locale

Reference links: