I was facing a similar problem MobaXTerm was not letting me do any write changes or similar permissions issue.

In my case the solution was fairly simple but the reason which could be causing this to happen would be creation of a new user which does not have the permissions :
It can be fixed by going to the location where user is located and doing : chmod 777 /user

This may not work if you're tying to do "chmod 777 /home/user" as it could be treated as a folder asking for permissions rather than a User, So a better approach is to navigate to the User location and give permissions.

If it helps!