Which version of Lubuntu are you using?
Reboot your machine and open Terminal.
Then type these commands one at a time.
After each one press the Enter key.
When you are asked for your password, type it accurately (it is not displayed for security
), then press Enter again.
sudo apt-get purge ubuntu-tweak
sudo apt-get autoremove && sudo apt-get clean
sudo add-apt-repository -y ppa:tualatrix/ppa && sudo apt-get update
sudo apt-get install ubuntu-tweak
It is possible that you may have some broken packages. If so, report back.
Open your Home folder, right click on blank space with the folder, then click on Create Folder.
Give it a name instead of Untitled-1.
Similar procedure for new folder in a USB drive.