I learned a long time ago that I needed to uninstall avahi-daemon to prevent my system seeing printers in one of the libraries I visit. I always thought it was strange that only this library had this problem.
I always have to edit /boot/grub/grub.cfg after a new kernel is installed to eliminate (comment-out) the Windows section, as I don't want a dual-boot. So I did some research and learned of /etc/default/grub. Linux wikis, especially Arch, noted that a line in that file, GRUB_DISABLE_OS_PROBER=true, might allow me to avoid editing the file any more. So I edited that file and executed update-grub.
Wi-Fi crashed. At first I thought I had only screwed up Linux, but then I tried Windows 10. No Wi-Fi. I went and spoke with a librarian and she informed me that everything related to the Internet was down: Ethernet, Wi-Fi, and VOIP.
HOLY COW, I CRASHED THE LIBRARY!
No, I won't repeat it to confirm everything.
I went back and looked at Synaptic and realized that I had somehow forgotten to uninstall avahi-daemon.
Since this is the only library to allow me to see printers, I suspect that the admins have configured their system wrong somehow. Librarians think all patrons are children, so there's no point in trying to alert the admins, as the message would not be forwarded.
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