ok so of that list of plugins that needed to be updated, I was using 2, which I did download and update. However it still was not starting, figured out the matrix authorization strategy and the github authentication was giving issues as well. I backed up the config.xml file and just edited out the login credentials of those 2, and was able to get jenkins to start. I updated all the plugins, and replaced my backed up config.xml file, but now none of the login credentials are there and its not recognizing the github authentication.
is there an easier way to update all these plugins to the version that is required for this latest LTS release, before doing the jenkins upgrade?