sudo chmod 755 [file]: operation not permitted!

I wanted change the permission of a file that I own previously, so I typed:

$ sudo chmod 755 [file]
[sudo] password for rakinar2:
sudo: chmod: Operation not permitted

How do I fix this issue? I'm using ubuntu bionic.

EDIT [11 Jul 2021]: I run lsattr [file] and it says Permission denied while trying to stat [file]

5 Sorted by: Reset to default

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