I accidentally deleted tmp folder. than I was unable to visit browser neither could update/upgrade from terminal. I somehow managed to give 777 permissions to tmp. but When running sudo apt-get upgrade. producing following error.
Processing triggers for libc-bin (2.19-0ubuntu6.6) ...
Processing triggers for libreoffice-common (1:4.2.8-0ubuntu3) ...
E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the download directory
E: Problem executing scripts DPkg::Post-Invoke 'apt-get clean'
E: Sub-process returned an error code
sudo chmod 1777 /tmp
.