我想从Docker中删除所有Ubuntu镜像。这是docker images显示的内容:
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
nginx test b585568733c7 3 weeks ago 93.46 MB
ubuntu 14.04 ce76de2e871b 4 weeks ago 188 MB
ubuntu 12.04 583364cb662d 4 weeks ago 138 MB
tommylau/ocserv latest 26d1014b5930 5 weeks ago 145.6 MB
nginx 1.7.11 520f1dbba9d6 12 months ago 93.44 MB
如何用单个命令删除Ubuntu 14.04和Ubuntu 12.04?