The command could not be located because '/usr/bin' is not included in the PATH environment variable. error

if you are getting this error :

Symptoms :

1. You are not able to login, loging screen returning back to itself.
2. If you press alt+ctrl+[F1-F7] and issue some come command and its throwing this error.

Solution:

First check "echo $PATH" if it is having entries like

/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:
/bin:/sbin

Entries are there in the pats variable, if those are not there there is a problem.

So lets starrt :

Login with your user, on terminal type /usr/bin/vi or /usr/bin/vim /etc/environment

and add

PATH="/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/bin:/sbin"

and restart the machine.