aptitude install adwaita-icon-theme-full
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https://bugs.launchpad.net/bugs/1500673
Title:
gdm unusable after upgrading to 15.10
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这是一个非常坑爹的 bug 啊，经过很多次的安装、对比和验证，结论是缺少 adwaita-icon-theme-full 包
安装过程：
1、最小安装 Ubuntu 15.10 Server 版（64位）
2、aptitude install xorg xwayland
3、aptitude install gnome-shell gnome-shell-extensions gdm
4、aptitude install gnome-session-wayland
5、aptitude install adwaita-icon-theme-full
6、reboot
..
