The system had gone into undefined state. It was accessible via GUI but docker was down and /var/log/syslog showed number of error when I tried to simply reboot the system (either via GUI or manually via reboot command from console). I have attached a snippet of error output.
Not sure if this is a hardware issue that has developed or simply an OS bug.
Had a few instances where docker images would not start (rubbing is SSD cache) and had to reboot the box to clear this stalemate. Now I am a bit concerned.
As I am not an expert, would somebody be able to identify if this is a genuine bug or I need to replace the system (given its old, mobo is from 2011).