Ubuntu

Rough Notes

Run pavucontrol for Bluetooth headset related issues.
rm -r ~/.config/pulse; pulseaudio -k to make Bluetooth headphones if they do not work. If this does not, select Speakers - Built-in audio first then select the headphones again, the point is to avoid Mono sounds, the laptop microphone should be active.
As per this post there is no solution for the Mono + no microphone problem on Linux with a Bluetooth headset.
Figure out page size of pdf: pdfinfo mydoc.pdf | grep 'Page size'