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rated 0 times [ 65] [ 0] / answers: 1 / hits: 142102 / 1 Year ago, wed, december 7, 2022, 4:13:43

screenshot

It didn't fixed the error. So, how do I fix my GUI update?

For every software I have to install it from command line because I got same error when install software from Ubuntu Software Center.

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answered 1 Year ago feeous · Accepted Answer

Write in a terminal: sudo apt-get update && sudo apt-get upgrade or edit Update Manager settings (try this first if you have already configured Update Manager).

Running update through a terminal gives option whether to allow or disallow untrusted packages.

WARNING: The following packages cannot be authenticated!

  playonlinux

Install these packages without verification [y/N]?

If you trust the package source, type y.