Print queue information is saved in the /etc/cups/printers.conf file. Is
CUPS able to write into it (see whether it actually contains the info
about the queues you have set up)? Does the file survive a reboot (must
be on a real HD file system, not on a RAM disk or so)? Backup the file
after configuring the printers. Then restart CUPS via

sudo /etc/init.d/cups stop
sudo /etc/init.d/cups start

Compare /etc/cups/printers.conf with the backup. Did something change?
Does CUPS still list the queues? If the file changed, stop CUPS, restore
the file and start CUPS. Is then all back to normal again?

Reboot your computer. Compare /etc/cups/printers.conf with the backup
again. Did something change? Does CUPS still list the queues? If the
file changed, stop CUPS, restore the file and start CUPS. Is then all
back to normal again?

** Changed in: cups (Ubuntu)
       Status: New => Incomplete

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cups lost all printers after reboot
https://bugs.launchpad.net/bugs/584188
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