-
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).

-
Launch Update Manager and try again.

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.
本文介绍了解决Ubuntu系统中遇到的软件包验证问题的方法。通过在终端执行特定命令或编辑Update Manager设置来解决无法验证某些软件包的问题。文章还提到了如何处理不可验证的软件包并给出了解决方案。

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