Method One - Terminal:

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   Open the terminal. The terminal is the app that has an image a black screen with a prompt in the upper-left corner.

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   Type the following command in the terminal and press Enter. sudo su -c "apt-get update". This command checks for new updates from a repository of packages.^[1]

    

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   Type the next command in the terminal and press Enter. sudo su -c "dpkg --configure -a". This command corrects issues with dpkg.

    

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   Type the next command in the terminal and press Enter. sudo su -c "apt-get -f install". This command attempts to fix broken dependencies in the system ^[2]

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   Restart Ubuntu. After executing the commands in the terminal, restart Ubuntu and check to see if the issues are fixed. If they are not fixed, continue to the next method.

    

Method Two - Recovery Mode

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   Restart Ubuntu. In order to boot into the GRUB menu on Ubuntu, you will need to reboot Ubuntu. To restart Ubuntu, click the icon that resembles a gear in the upper-right corner and select "Shut Down".

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   Press and hold ⇧ Shift as your computer restarts. This loads the GRUB boot splash screen.

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   Select Advanced Options for Ubuntu. It's the second option on the GRUB boot splash screen.

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   Select Ubuntu, with Linux x.xx.x 32 generic (recovery mode). This boots Ubuntu in Recovery Mode.

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   Select dpkg Repair broken packages. It's the third option in the recovery menu. This will attempt to fix broken packages in Ubuntu. It will also scan your hard drive for errors. Look for the output of drivers check-up containing blocks. If errors are reported, there may be an issue with your hard drive. If no errors are reported, and the problem is still not fixed, You may need to reinstall Ubuntu. ^[3]

   • If problems still persist, you may need to reinstall Ubuntu. This will erase all the data on your drive. Read Install Ubuntu Linux for to learn more about how to install Ubuntu.