So I recently installed adb and fastboot via apt-get android-tool-adb and android-tools-fastboot. I am having trouble with fastboot detecting my device. When I run fastboot I get command not found and when I runt fastboot devices I get new line and no detected device. If anyone has any info on this please assist me in correcting this. When I use "adb" devices I get

928@penguin:~$ adb devices
List of devices attached
43e56835 device

and when I run "fastboot devices" I get


928@penguin:~$ fastboot devices
928@penguin:~$

Also when I run "fastboot flash twrp.img" i get

928@penguin:~$ fastboot flash twrp.img
< waiting for any device >


Any info is highly appreciated

Are you running fastboot as root? It may need that, or you need to put you phone into fastboot mode to be detected.

IIRC fastboot only recognizes devices in recovery mode.