getting an error on ubuntu : Command 'sudo' is available in '/usr/bin/sudo' -

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i trying install java . getting following error . 

:~$ sudo apt-get update command 'sudo' available in '/usr/bin/sudo' command not located because '/usr/bin' not included in path environment variable. sudo: command not found

i dont know how resolve problem?

you can check content of path variable executing command $ echo $path

if not find /usr/bin in output can append /usr/bin in path variable executing command

$ export path=$path:/usr/bin


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