remove the GUI if you don 't need it
delete downloaded .deb packages
# df -h Filesystem Size Used Avail Use% Mounted on rootfs 3.6G 1.2G 2.3G 34% / ... # ls /var/cache/apt/archives/ autoconf_2.69-1_all.deb libldap2-dev_2.4.31-1+nmu2_armhf.deb lockfile-progs_0.1.17_armhf.deb automake_1%3a1.11.6-1_all.deb liblockfile1_1.09-5_armhf.deb m4_1.4.16-3_armhf.deb autotools-dev_20120608.1_all.deb liblockfile-bin_1.09-5_armhf.deb ...
# apt-get clean # ls /var/cache/apt/archives/ lock partial
# df -h Filesystem Size Used Avail Use% Mounted on rootfs 3.6G 1.1G 2.4G 32% / ...
keep raspberry pi images small