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I'm trying to login to my elementaryOS and i stuck in a loop(i enter password, press enter and it back to login). I entered the terminal (ctrl+alt+f3) to see what's going on with permissions, and i got the error: bash: cannot create temp file for here-document: No space left on device so i checked my partition, and found got this:

Filesystem Size Used Avail Use% Mounted on udev 3.9G 0 3.9G 0% /dev tmpfs 787M 1.6M 785M 1% /run /dev/sda5 17G 16G 0 100% / tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/loop0 411M 411M 0 100% /snap/wine-platform/74 /dev/loop1 91M 91M 0 100% /snap/core/6405 /dev/loop3 174M 174M 0 100% /snap/spotify/34 /dev/loop2 98M 98M 0 100% /snap/docker/321 /dev/loop4 128K 128K 0 100% /snap/league/22 /dev/loop5 411M 411M 0 100% /snap/wine-platform/88 /dev/sda7 47G 4.0G 41G 9% /home /dev/sda1 246M 31M 226M 13% /boot/efi tmpfs 787M 0 787M 0% /run/user/1000 tmpfs 787M 4.0K 787M 1% /run/user/110

how can i solve this?

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    Start from a Live USB and use gparted to allocate some space from sda7 to sda5. 17G is not enough for elementary root partition. I'd say with 25G you're on the safe side. See here Commented Mar 4, 2019 at 10:29
  • But what is on the sda5? and why it installing stuff there and not to home?(where i allocated most of my ssd) how can i access whats on sda5 and delete? Commented Mar 4, 2019 at 10:36
  • The system and all installed programs are in /, not /home (where your personal data and the programs personal configuration files are). (see unix.stackexchange.com/questions/371593/…). Commented Mar 4, 2019 at 10:37
  • Oh i see..i been mistaken then.. can i just uninstall some programs and get that space back for now? (Doesn't have usb thumb drive right now) how can i list all programs on root and uninstall them? Or even better, see which programs take most space Commented Mar 4, 2019 at 10:43

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17G is usually not enough for the root partition of Ubuntu or its derivatives if you want to install some bigger software. I'd say with 25-30G you're on the safe side.

Temporary Solution to be able to log in again:
From terminal, try to remove some bigger software packages you don't need right now:

sudo apt remove some-big-software

Also it should be safe to remove files in /tmp/ and /var/log/ to gain some space to be able to login again

sudo rm -Rf /tmp/* sudo rm -Rf /var/log/*

Solution:
Start from a Live USB and use gparted to allocate some space from sda7 to sda5. See here.

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