For people running into this and not knowing how to easily fix:

Feb 20 09:15:19 tequila sshd[18110]: pam_env(sshd:setcred): Unable to open env file: /etc/default/locale: No such file or directory

tequila:~# ls /etc/default/locale
ls: cannot access /etc/default/locale: No such file or directory
tequila:~# update-locale
tequila:~# ls /etc/default/locale
/etc/default/locale

Or just fill it yourself:

tequila:~# cat /etc/default/locale
#  File generated by update-locale
LANG=en_US
 

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