我不熟悉以下错误以及如何修复它，当我在ubuntu 14.04.3中启动终端时会发生这种情况。我不发送任何命令只按crtl + alt + T.这似乎表明PATH缺少某些东西，但我不确定是什么。谢谢你:)。
Command 'lesspipe' is available in the following places
* /bin/lesspipe
* /usr/bin/lesspipe
The command could not be located because '/usr/bin:/bin' is not included in the PATH environment variable.
lesspipe: command not found
Command 'dircolors' is available in '/usr/bin/dircolors'
The command could not be located because '/usr/bin' is not included in the PATH environment variable.
dircolors: command not found
Command 'ls' is available in '/bin/ls'
The command could not be located because '/bin' is not included in the PATH environment variable.
ls: command not found
cmccabe@HP-Z640-Workstation:~$