Jenkins is not working after a OS upgrade, Ubuntu 20.04 OS

please let me know how to come out of this

That message was probably preceded in the logs with a message that the SAML plugin did not load. The messages near that failure will suggest what you need to do. It may be that a plugin dependency is missing. It may be that a plugin upgrade is needed.

As a suggestion for the future, please post stack traces as text rather than posting them as pictures. Those who are willing to help are much more willing to help when they can copy the text from the message and paste it into various other locations like search engines. It also helps others later because it is more likely that a web search will find a stack trace in text than a stack trace in a picture.

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