Imports fail due to unavailable locale

[Robie Basak]

$ git ubuntu import -v -d hello hello
09/03/2020 16:45:06 - DEBUG:Executing: git config gitubuntu.lpuser
Traceback (most recent call last):
  File "/snap/git-ubuntu/x1/bin/git-ubuntu", line 11, in <module>
    load_entry_point('gitubuntu==1.0rc1', 'console_scripts', 'git-ubuntu')()
  File "/snap/git-ubuntu/x1/lib/python3.6/site-packages/gitubuntu/__main__.py", line 279, in main
    sys.exit(args.func(args))
  File "/snap/git-ubuntu/x1/lib/python3.6/site-packages/gitubuntu/importer.py", line 2384, in cli_main
    changelog_date_override_file=args.changelog_date_override_file,
  File "/snap/git-ubuntu/x1/lib/python3.6/site-packages/gitubuntu/importer.py", line 492, in main
    locale.setlocale(locale.LC_ALL, 'C.UTF-8')
  File "/snap/git-ubuntu/x1/usr/lib/python3.6/locale.py", line 598, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

$ snap info git-ubuntu
...
installed: 1.0-rc1+git52.649af7b (x1) 117MB classic

$ cat /etc/cloud/build.info
build_name: server
serial: 20200701

This affects commit 649af7b on master.