截至昨天，我只能使用内核选项启动nomodeset。在正常关闭之前发生的唯一事情是升级：
Start-Date: 2016-11-26 00:09:51
Commandline: apt-get -y dist-upgrade
Requested-By: XXXXX (1000)
Upgrade: imagemagick:amd64 (8:6.8.9.9-7ubuntu5.1, 8:6.8.9.9-7ubuntu5.2), libpulsedsp:amd64 (1:8.0-0ubuntu3, 1:8.0-0ubuntu3.1), pulseaudio:amd64 (1:8.0-0ubuntu3, 1:8.0-0ubuntu3.1), gstreamer1.0-plugins-good:amd64 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), python2.7-minimal:amd64 (2.7.12-1~16.04, 2.7.12-1ubuntu0~16.04.1), libmagickwand-6.q16-2:amd64 (8:6.8.9.9-7ubuntu5.1, 8:6.8.9.9-7ubuntu5.2), libpython2.7:amd64 (2.7.12-1~16.04, 2.7.12-1ubuntu0~16.04.1), python2.7:amd64 (2.7.12-1~16.04, 2.7.12-1ubuntu0~16.04.1), libpython3.5:amd64 (3.5.2-2~16.04, 3.5.2-2ubuntu0~16.04.1), python3.5:amd64 (3.5.2-2~16.04, 3.5.2-2ubuntu0~16.04.1), python3.5-minimal:amd64 (3.5.2-2~16.04, 3.5.2-2ubuntu0~16.04.1), gstreamer1.0-plugins-base:amd64 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), gstreamer1.0-plugins-base:i386 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), libgstreamer-plugins-good1.0-0:amd64 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), imagemagick-6.q16:amd64 (8:6.8.9.9-7ubuntu5.1, 8:6.8.9.9-7ubuntu5.2), libmagickcore-6.q16-2-extra:amd64 (8:6.8.9.9-7ubuntu5.1, 8:6.8.9.9-7ubuntu5.2), libpulse0:amd64 (1:8.0-0ubuntu3, 1:8.0-0ubuntu3.1), libpulse0:i386 (1:8.0-0ubuntu3, 1:8.0-0ubuntu3.1), libpulse-mainloop-glib0:amd64 (1:8.0-0ubuntu3, 1:8.0-0ubuntu3.1), tar:amd64 (1.28-2.1, 1.28-2.1ubuntu0.1), libgstreamer-plugins-base1.0-0:amd64 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), libgstreamer-plugins-base1.0-0:i386 (1.8.2-1ubuntu0.1, 1.8.2-1ubuntu0.2), …