petep's questions

I use sudo brctl delbr br0 but its back after reboot. I also tryd sudo brctl delif br0. But it always back after rebooting.

cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

cat /etc/netplan/*.yaml

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp4s0f0:
      dhcp4: no
      addresses: [10.0.0.199/24]
      gateway4: 10.0.0.1
      nameservers:
        addresses: [8.8.8.8, 1.1.1.1]

How is it possible to make the boot drive always sda. Recently ubuntu 18.04.5 changed boot drive to sdb1. I have written shell scripts that assume boot drive is sda. Is there way to make the boot drive always appear as sda1 for example. Like with some setting in files somewhere. Thank you.