几天前我发现我无法通过sftp.然后我发现当我通过 登录时，欢迎消息中有一个点ssh。
.Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.15.0-72-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
* Ubuntu 20.04 LTS is out, raising the bar on performance, security,
and optimisation for Intel, AMD, Nvidia, ARM64 and Z15 as well as
AWS, Azure and Google Cloud.
https://ubuntu.com/blog/ubuntu-20-04-lts-arrives
31 packages can be updated.
0 updates are security updates.
*** System restart required ***
“欢迎来到...”前面有一个点。我确信这个点不是 motd 的一部分。我尝试ssh username@remote "echo hello"，并得到“.hello”。我试图找出它来自哪里但失败了，而且我是 Linux 新手。有人知道这个点从哪里来吗？