Thanks for the resolution. That worked. But what to do after that. It is not letting me login. If I do so, it gives me the error:
PLEASE HELP
Nicketa Kumar struggling with the same setup in Ubuntu 18.10. Care to share how you resolved this?
Thanks.
As stated by deep jain first you need to disable the security. https://issues.jenkins-ci.org/browse/JENKINS-19010?focusedCommentId=185573&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-185573
After that you need to check or configure username and password. Once done, have to enable the security again. Try to login now with the username and password you just configured.
Further there are different types of security available on jenkins. Refer to https://wiki.jenkins.io/display/JENKINS/Standard+Security+Setup for configuration.
I was getting the same error after resetting the security.
The piece I was missing is that you also need to set the Security Realm back to "Jenkins' own user database"
Without that, you get the 403 no valid crumb error.