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The system settings for my Linux Mint OS, for example desktop background or mouse speed or screen resolution etc. won't change, for some reason.

I just restarted my computer and for some reason the background had changed and the Computer icon was missing. When I tried to change these settings by going to the System Settings menu, the changes won't save.

Is there a way to resolve this?

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It sounds like an issue of permissions. Open the System Settings menu under root through terminal to get full access. I'd look at the permissions of those files though, do a whereis (config tool here) to find where the files are and post the permissions on them (ls -la | grep (config tool here))

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