更新后，您可以安装旧版本的壁纸：
sudo apt-get install ubuntu-wallpapers-xxxxx
其中 -xxxxx 来自以下列表：
ubuntu-wallpapers: Ubuntu Wallpapers
ubuntu-wallpapers-artful: Ubuntu 17.10 Wallpapers
ubuntu-wallpapers-bionic: Ubuntu 18.04 Wallpapers
ubuntu-wallpapers-karmic: Ubuntu 9.10 Wallpapers
ubuntu-wallpapers-lucid: Ubuntu 10.04 Wallpapers
ubuntu-wallpapers-maverick: Ubuntu 10.10 Wallpapers
ubuntu-wallpapers-natty: Ubuntu 11.04 Wallpapers
ubuntu-wallpapers-oneiric: Ubuntu 11.10 Wallpapers
ubuntu-wallpapers-precise: Ubuntu 12.04 Wallpapers
ubuntu-wallpapers-quantal: Ubuntu 12.10 Wallpapers
ubuntu-wallpapers-raring: Ubuntu 13.04 Wallpapers
ubuntu-wallpapers-saucy: Ubuntu 13.10 Wallpapers
ubuntu-wallpapers-trusty: Ubuntu 14.04 Wallpapers
ubuntu-wallpapers-utopic: Ubuntu 14.10 Wallpapers
ubuntu-wallpapers-vivid: Ubuntu 15.04 Wallpapers
ubuntu-wallpapers-wily: Ubuntu 15.10 Wallpapers
ubuntu-wallpapers-xenial: Ubuntu 16.04 Wallpapers
ubuntu-wallpapers-yakkety: Ubuntu 16.10 Wallpapers
ubuntu-wallpapers-zesty: Ubuntu 17.04 Wallpapers