1. Mount your Ubuntu installation by clicking on the device's icon in the file manager.
2. Open a terminal and cd into the /usr/bin folder of that installation you mounted from above.
3. Run this command to give all users execute permissions
sudo chmod -R a+x .4. Run this command to give all users read permissionssudo chmod -R a+r .
5. Run this command to remove all users (except root's) write permissions
sudo chmod -R o-w .
6. Reboot and see if it works.
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