cannot create temp file for here-document no space left on device

hello everyone, today I came across a problem in my system, I wanted to know if someone has already solved it and can help me.

[email protected]:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 947M 0 947M 0% /dev
tmpfs 199M 1.9M 197M 1% /run
/dev/mapper/ubuntu–vg-ubuntu–lv 9.8G 9.7G 0 100% /
tmpfs 992M 0 992M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 992M 0 992M 0% /sys/fs/cgroup
/dev/loop0 64M 64M 0 100% /snap/core20/1828
/dev/loop2 92M 92M 0 100% /snap/lxd/24061
/dev/loop3 50M 50M 0 100% /snap/snapd/18357
/dev/loop1 64M 64M 0 100% /snap/core20/1879
/dev/loop4 54M 54M 0 100% /snap/snapd/19122
/dev/sda2 1.8G 108M 1.5G 7% /boot
tmpfs 199M 0 199M 0% /run/user/1000

can someone help me to increase the size? actually it’s running on a proxmox and I’ve already left enough space available, I don’t know if you need to run any commands.