When i login to ubuntu, i have no time and date displayed on top-right corner of my ubuntu top bar.
First go to System Settings > Time & Date and check if Show a clock in menu bar is checked. If this is unchecked, just check it, Date and Time will show up.
It if it checked and is grayed (disabled), then it is something with indicator-datetime-service, check if the process is running
boby@fwhlin:~ $ ps aux | grep indicator-datetime-service boby 3113 0.0 0.1 453148 6616 ? Ssl 07:15 0:00 /usr/lib/x86_64-linux-gnu/indicator-datetime/indicator-datetime-service boby 5257 0.0 0.0 15940 956 pts/26 S+ 08:00 0:00 grep --color=auto indicator-datetime-service boby@fwhlin:~ $
I have the process running with 3113
I done sudo strace -p 3113, it was stuck at futex command.
So i killed the process with command
boby@fwhlin:~ $ kill -9 3113 boby@fwhlin:~ $
This auto restarted indicator-datetime-service and Date and Time started showing up.
You can also try running the command from terminal
This will show the Date and Time, but won’t go in foreground, you can force it with &, but killing existing process will do it.