Bios not seeing ubuntu?

Question

ubuntu

Hello everyone, I want to make ubuntu on a flash drive. I downloaded the distro ubuntu 20.04.3, wrote it with Rufus on flash drive #1, booted from this flash drive and installed ubuntu on flash drive #2 (I chose ext4 as the file system, specified the mount point "/"). Ubuntu was installed on flash drive number 2, I rebooted and tried to log in from this flash drive, but it failed, because the BIOS does not see it, it only sees the windows boot manager (uefi is selected in the BIOS, security boot is disabled)

Answer 1

grub installed? to a flash drive then ...
try to do the same operation, only by disconnecting all disks except flash drives ...

Answer 2

Ubuntu can work from a flash drive in the mode like a regular distribution, for this you can use the creation of a boot disk using "Unetbootin" and select the size of the partition with user data there: