Hi all, I'd like to know how to downgrade the kernel version in Ubuntu systems? I'm having a system with Ubuntu 18.04.4 LTS(4.15.0-91-generic kernel) and I want to downgrade only the kernel version to 4.4.0-66-generic(it is part of 16.04). Is it possible? If so can someone please clarify to me on how to do this? -- Thanks, Sekhar