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I need help. I'm using ubuntu 16.04.5 LTS. i wanna edit the crontab and i already login as root. when i run command "crontab -e", there is already a schedule that download file and execute. i think it's a trojan so i want to remove from crontab but everytime i change the crontab, the error message show "operation not permitted".

crontab list

cannot edit crontab

file access

How to fix this problem and remove the injected script in my crontab?

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This error message is often shown for files with the 'immutable' or 'append-only' attributes. Use lsattr on the files (and their parent folder) to check whether they have this attribute, and chattr to remove it.

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