boot

If your Ubuntu installation locks up as the graphical boot screen attempts to initialize, and you can't get access to your system after starting it up, booting into a previous version can be a help.

This can happen after updating to the the latest update to Linux 4.4.0-108 kernel, which included a fix for the Meltdown vulnerability.

Enter these commands in your terminal to prevent the log in screen after boot to disappear too quickly:

gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 900
gsettings set org.gnome.desktop.session idle-delay "uint32 900"
gsettings set org.gnome.desktop.screensaver lock-delay "uint32 900"