I recently installed Lubuntu 16.04 on a laptop, removing everything (it had a few partition issues) and re-creating disk partitions from scratch. However, the system is not able to install any new software or package, because it says it has:
No free space. The upgrade needs a total of 1.221 M free space on disk '/'. Please free at least an additional 1.150 M of disk space on '/'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean
I install Ubuntu many times but I never had this issue. The laptop should have around 900Gb of free memory on the partition. Any idea why this might be happening?