Reading through one of the bugs posted, I ran 'hp-firmware'. Got the following 
output
pree...@acer-laptop:~$ hp-firmware
warning: Qt/PyQt 4 initialization failed.
error: hp-firmware -u/--gui requires Qt4 GUI support. Entering interactive mode.

HP Linux Imaging and Printing System (ver. 3.9.8)
Firmware Download Utility ver. 2.4

Copyright (c) 2001-9 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Using device: hp:/usb/HP_LaserJet_1020?serial=FN0X958


HP Linux Imaging and Printing System (ver. 3.9.8)
System Tray Status Service ver. 2.0

Copyright (c) 2001-9 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

warning: Qt/PyQt 4 initialization failed.
error: hp-systray requires Qt4 GUI and DBus support. Exiting.
warning: Unable to connect to dbus. Is hp-systray running?
Done.
Now the problem is solved

Thank you

-- 
HP Laserjet 1020 gets installed but not printing
https://bugs.launchpad.net/bugs/480224
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