pi@raspberrypi:/var $ df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 1304692 1135292 85076 94% /
devtmpfs 469752 0 469752 0% /dev
tmpfs 474068 0 474068 0% /dev/shm
tmpfs 474068 6288 467780 2% /run
tmpfs 5120 4 5116 1% /run/lock
tmpfs 474068 0 474068 0% /sys/fs/cgroup
/dev/mmcblk0p1 61384 20328 41056 34% /boot
pi@raspberrypi:/var $ sudo du -a /var | sort -n -r | head -n 10
175740 /var
102404 /var/swap
65064 /var/lib
46936 /var/lib/apt
46908 /var/lib/apt/lists
45684 /var/lib/apt/lists/mirrordirector.raspbian.org_raspbian_dists_jessie_main_binary-armhf_Packages
16452 /var/lib/dpkg
15284 /var/lib/dpkg/info
4492 /var/log
3588 /var/cache
What can I do to get more space?