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I am using Ubuntu 16.04 LTS.

Whenever I try to install updates using the terminal window, I get this error.

Also when I go into the Software Center there is software shown.

Please help.

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Sudo is working fine, you my guess is you edited /etc/apt/sources.list and have a typo.

Open an editor an comment out line 54

sudo nano /etc/apt/sources.list

Find line 54 and remove it

See also How to show line numbering in nano when opening a file for information on how to show and go to specific lines with nano.

If you need help, post the contents of the file, better line 54.

|improve this answer|||||
  • sudo apt-get update sudo apt-get install r-base r-base-dev ; Please help. – Harshvardhan May 11 '17 at 18:53
  • And how do I remove lines? – Harshvardhan May 11 '17 at 18:55
  • delete button or back space. Arrow keys to navigate – Panther May 11 '17 at 18:56

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