Hi! I have a separate /var partition, size 10Gb (actually, 9.1Gb per sudo df -h).
It is now about 41% full; 3.5Gb used, 5.1Gb free, per sudo df -h. The biggest chunk of var used seems to be /var/cache/apt/archives, at about 1.7Gb. I am considering just running sudo apt clean (or sudo apt-get clean) to just clear out the packages cache completely, in order to free up space in /var. I realize that any packages that need to be re-installed would take more time to do so, since they would have to come from online respositories. Other than that, is there any good reason not to do sudo apt clean?