Hi, I'm having the exact same issue with my fresh install of Debian Bookworm on an HP Elitebook 840 G11. I installed dropbear-initramfs and whenever I boot without the RTL8153 usb network dongle, I have a looping output on pts/0 saying sleep/cat not found.
I also see 'command not found: ipconfig' (not exact wording) on some occasions. Sincerely yours, Fabien Wernli
