This seems to be a simple permission problem. The user is not allowed to read /etc/apt/auth.conf.d/90ubuntu-advantage
So instead of: apt source libopenexr25 use: sudo apt source libopenexr25
If you need to run it as a user fix the permissions of /etc/apt/auth.conf.d/90ubuntu-advantage
This seems to be a simple permission problem. auth.conf. d/90ubuntu- advantage
The user is not allowed to read /etc/apt/
So instead of:
apt source libopenexr25
use:
sudo apt source libopenexr25
If you need to run it as a user fix the permissions of auth.conf. d/90ubuntu- advantage
/etc/apt/