I was updating Ubuntu 16.04 from Ubuntu 14.04, but while installing packages it started to show tty screen then I rebooted my machine.
On startup it start to show a message like starting show plymouth...... .I googled and found a command dpkg --configure -a
.
After running this command my machine displaying message
/dev/sda5 :clean, 649920/318464 files, 11434504/12720128 blocks
and not getting started.