由于 PATH 环境问题，我出现循环登录

Question

由于循环，我无法登录。因此我按Ctrl+ Alt+ F3，登录并​​显示：

Command 'lesspipe' is available in the following places
* /bin/lesspipe
* /usr/bin/lesspipe
The command could not be located because '/bin:/usr/bin' is not included in the PATH environment variable.
lesspipe: command not found
Command 'dircolors' is available in the following places
* /bin/dircolors
* /usr/bin/dircolors
The command could not be located because '/bin:/usr/bin' is not included in the PATH environment variable.
dircolors: command not found

我正在使用 Ubuntu 20.04.1 LTS