Hi Daniel, I played around with VirtualBox settings and Ubuntu installer settings: The problem seems to occur only when "Install third-party software for graphics and Wi-Fi hardware and additional media formats" is selected in the Ubuntu installer.
If the option is _not_ selected, the installed system boots normally. And indeed, after then installing the package ubuntu-restricted-extras, the problem occurs on the next boot.
Hi Daniel, I played around with VirtualBox settings and Ubuntu installer settings: The problem seems to occur only when "Install third-party software for graphics and Wi-Fi hardware and additional media formats" is selected in the Ubuntu installer.
If the option is _not_ selected, the installed system boots normally. And indeed, after then installing the package ubuntu- restricted- extras, the problem occurs on the next boot.