Shift + PageUp and
Shift + PageDownare the normal Ubuntu shortcut keys for scrolling up and down without the mouse in the terminal emulator. It doesn't seem to work in Windows Subsystem for Linux for me (Windows 10 1607, Lenovo Carbon X1 2015).
Has anyone figured out a workaround or know if this feature is on its way? I see some discussion here: https://github.com/Microsoft/BashOnWindows/issues/279