How do I fix garbled system logs Ubuntu 20.04

[mahesh]

Hi,
For some reason my system logs on OS Ubuntu 20.04 are all messed up. I don't get system logs itemized by login session anymore. Instead, there is one huge log all garbled up, bearing the date Jan 10 2022-March 13 2032.

Is there an easy fix for this glitch, using the command line and bash?

Thanks for your help.