[SOLVED] Bootable pendrive not detected on OS catalina

[vinchurkarsanket608]

I m trying to dual boot my system with ubuntu 18.04.I saw and followed many youtube tutorial on how to do it.
I make a bootable pd using balena etcher app,but when I restart mac pressing option key,
It does'nt show me the PD.

 

[velocityg4]

If your Mac has a T2 chip. You need to disable Secure Boot. Also allow booting from external media.

https://support.apple.com/en-us/HT208330