Late upgrading to Ubuntu 18.04, read this!

If you are still running Ubuntu 14.04 and did not upgrade before it went EoL, you will have problems - guaranteed.

Read this post for help resolving these problems, and next time upgrade before your OS becomes EoL.

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Ubuntu 14.04 is technically not EOL until April 2022. Standard support however ran out, it is still getting security releases (technically)
See:

Yeah but IIRC support after April 2019 costs $$$$.

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