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Once I installed Ubuntu 16.04LTS, followed by Upgrading to Ubuntu 18.04LTS. After all the new Ubuntu 18.04LTS package get downloaded, Unfortunately new Installation get Interrupted.

When I tried to power on my computer it gives back the black screen with message dpkg failed.

How can i restore the Installation?

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  • If you installed Ubuntu 16.04 just before, it would be better to reinstall 18.04 from scratch instead of upgrading. – David Foerster May 19 '18 at 21:13
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As we know Ubuntu can manager 6 users in command Line at once, while the user number 7 is the only one who can user the Interface.

  1. Simply Click Ctrl + Alt + F1 then login by administrator username and password.

  2. Type sudo dpkg --configure -a

  3. Then press Enter, the upgrade package installation will continue, then reboot

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  • I think they switched things up for Ubuntu 17.10 or 18.04 and they use 1 and 2 for the GUI now, so they might need Ctrl+Alt+F3. – Chai T. Rex May 19 '18 at 20:17

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