erro ao iniciar o terminal no Ubuntu 14.04.3

Question

Eu não estou familiarizado com o erro abaixo e como corrigi-lo, isso acontece quando eu inicio o terminal no Ubuntu 14.04.3. Eu não envio nenhum comando apenas pressionando crtl + alt + T . Parece indicar que algo está faltando no PATH, mas não tenho certeza sobre o quê.

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

PATH

$ cmccabe@HP-Z640-Workstation:~$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:  /usr/local/games:/home/cmccabe/tabix-0.2.6