no space left in '/' but a lot space left in '/home' [duplicate]

Question

i install ubuntu and followed a guide to put 20gb in '/' and the rest (150gb) in '/home'. Now i just found out that a lot of the things installed in ubuntu usually goes to '/' instead of '/home'. I have a lot more things to install.

So what is the point of '/home' ? How do I fix this ? Should I transfer 150gb from '/home' to / ?

Filesystem      Size  Used Avail Use% Mounted on
udev            7.8G     0  7.8G   0% /dev
tmpfs           1.6G  9.5M  1.6G   1% /run
/dev/sda6        19G   16G  1.8G  91% /
tmpfs           7.8G  676K  7.8G   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/sda2        96M   29M   68M  31% /boot/efi
/dev/sda8       159G  1.1G  150G   1% /home
tmpfs           1.6G   56K  1.6G   1% /run/user/1000

what is /boot ? Its not '/' or '/home'

Answer 1

/home contains user data by default. It allows easy upgrade/change/re-install of the OS (ubuntu *; even changing to another, say openSUSE, Debian, ...) without causing wipe of your user data if a re-install is done.

You don't need a separate /home, but nearly everyone who didn't have it will eventually want it. The 20GB / guide makes a huge assumption on what you'll load & use the system for; and for most 16gb is heaps, but I on [rare] occasion find 32GB small. Adjust default/guides according to your intended use & software-needs.

Anyway, you can re-adjust partitions sizes (gparted but best done with live-media so the partition is NOT in use), or even move specific directories to store data on /home by /etc/fstab filesystem hacks etc.

What is best for you will depend upon your usage. (What's making you hit the 20GB wall?)