sudo chown is resulting in this error. Can someone please help?

chown: invalid user: ‘user:group’

Screenshot of Error message

  • 3
    I’m voting to close this question because screenshots of windows of text outputs are ridiculous. Commented Sep 30, 2022 at 5:44
  • 3
    but you see the error and know the answer to help, but you do not want to help. <3 this world Commented Oct 2, 2022 at 14:31

2 Answers 2


You have to actually put in your user name and group name - eg

sudo chown pt:pt /usr/lib/libcastle 

Changes the owner of that file to pt and the group also to pt.


What is the problem by this command? Server:/ # drwxr-xr-x 40 root root 4096 Jun 4 08:25 data drwxrwxrwt 42 root root 4096 Jun 4 09:09 tmp SERVER:/ # chown /data/postgres1 root.postgres postgres1/ chown: invalid user: ‘/data/postgres1’ Server:/ #

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