"No space left on device" ubuntu

Question

Filesystem      Size  Used Avail Use% Mounted on
udev            1.9G     0  1.9G   0% /dev
tmpfs           387M  6.3M  380M   2% /run
/dev/sda3       4.6G  4.1G  263M  95% /
tmpfs           1.9G  1.4M  1.9G   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda8        14G  513M   13G   4% /home
/dev/sda7       453M   61M  366M  15% /boot
tmpfs           387M   64K  387M   1% /run/user/1000

1. What should I do?

2. What can I delete?

Answer 1

You have given too few points to /. Check to see if any unused software has been uninstalled. If there are many things in /tmp, just restart. If there are many logs in /var/log, clear the logs.

If it is not a production machine, you can consider reinstalling it, or if you use lvm, you can dynamically adjust it.

Answer 2

Reinstall Ubuntu...
Do not create partition for /home or something others...
One partition, / is enough, because your disk is tooooooo small...
If your RAM is less than 8G, then create a swap partion(2G~4G) on the tail of your disk...