How to use Sumatra pdf reader on Ubuntu

Download the windows executable SumatraPDF.exe
and (install and) use wine.

To use it by default, make a script, say sumatra, that does
wine SumatraPDF.exe $1
and make it the default by picking any pdf, right-click -> properties -> open with
and selecting sumatra.

(I found Adobe heavy with Ubuntu Linux 14.04 on an old computer, and inclined
to freeze or crash. Sumatra is much leaner and faster, and works fine.)