Mosh가 설치되었지만 표시되지 않습니다

mosh을 통해 서버에 연결하려고 하면 다음과 같은 일련의 오류 메시지가 생성됩니다. 이는 명령이 이전에 실행되어 서버에 mosh가 설치되어 있음을 보여주었음에도 불구하고 발생합니다.

sudo apt-get install mosh
[sudo] password for jerdvo:
Reading package lists... Done
Building dependency tree
Reading state information... Done
mosh is already the newest version (1.3.2-2.1build3).
The following package was automatically installed and is no longer required:
  libfwupdplugin1
Use 'sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 46 not upgraded.

오류는 다음과 같습니다. 다음을 제외하고는 부적절한 로케일의 징후도 있습니다.Did not find mosh server startup message

어떤 토끼를 먼저 쫓아야 하며, 어떻게 쫓아야 할까요?

서버: 우분투 20.04
로컬: OSX 10.13.6

The locale requested by LC_CTYPE=UTF-8 isn't available here.
Running `locale-gen UTF-8' may be necessary.

The locale requested by LC_CTYPE=UTF-8 isn't available here.
Running `locale-gen UTF-8' may be necessary.

mosh-server needs a UTF-8 native locale to run.

Unfortunately, the local environment (LC_CTYPE=UTF-8) specifies
the character set "US-ASCII",

The client-supplied environment (LC_CTYPE=UTF-8) specifies
the character set "US-ASCII".

locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=
LANGUAGE=
LC_CTYPE=UTF-8
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
Connection to 159...33 closed.
/usr/local/bin/mosh: Did not find mosh server startup message. (Have you installed mosh on your server?)

의견에서 제안한대로 이것을 시도했습니다.

locale-gen UTF-8
Error: 'UTF-8' is not a supported language or locale

...정말 이상하네요...

그러다가 도망갔어

sudo dpkg-reconfigure locales
en_us.UTF-8

sudo update-locale 
LANG=en_US.UTF-8
Error: 'UTF-8' is not a supported language or locale

지금 어디 있나요?