Increase linux disk space?

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Ubuntu usually has at least three partitions - root, home, and swap(or something similar). Maybe you should check your other partitions before you start trying to free up partition space...Unless you custom installed Ubuntu on one partition

Open a terminal in Ubuntu and type df - what's the result?

Filesystem 1K-blocks Used Available Use% Mounted on
/host/ubuntu/disks/root.disk
16876388 11185968 4833128 70% /
tmpfs 1807328 0 1807328 0% /lib/init/rw
varrun 1807328 216 1807112 1% /var/run
varlock 1807328 0 1807328 0% /var/lock
udev 1807328 152 1807176 1% /dev
tmpfs 1807328 104 1807224 1% /dev/shm
/dev/sda5 107249908 18512928 88736980 18% /host
lrm 1807328 2192 1805136 1% /lib/modules/2.6.28-15-generic/volatile
/dev/sdb1 1019344 86736 932608 9% /media/360USBDRIVE