The HP OfficeJet Pro 8620 disappearing from Kubuntu 24.04 after a CUPS update is typically caused by the printer driver service failing to restart or losing its connection state. Reinstalling the HPLIP package via the official Ubuntu repositories and restarting the CUPS daemon usually restores visibility without requiring manual source compilation.
Understanding the Disappearance
When you install or update a Common Unix Printing System (CUPS) package on Kubuntu, the printing subsystem often undergoes a configuration reload. If the High Level Printer Driver Interface (HPLIP), which handles most HP inkjet printers like the OfficeJet Pro 8620, is not properly synchronized with the new CUPS version, the system may fail to list the device in the graphical settings menu. This is rarely a hardware failure but rather a software state mismatch where the print spooler no longer recognizes the local USB or network interface associated with the printer queue. It is important to distinguish this issue from connectivity problems that might affect networked printers. While Troubleshooting Internet Connection Issue on HP Printer 6200 Pro SFF Desktop addresses network layer failures, your current issue involves the local system's ability to see an already configured or detected device. The disappearance suggests that the CUPS database has been cleared or invalidated during the package transaction, leaving the printer in a limbo state where it exists physically but not logically within the OS.Step-by-Step Recovery Process
To resolve this, you must ensure that the necessary drivers are installed via the standard package manager and that the printing services are restarted cleanly. Avoid downloading drivers from third-party websites or attempting to compile code from source, as this can lead to dependency conflicts with the updated CUPS libraries in Ubuntu 24.04. First, open your terminal and verify if the HPLIP tools are present. Run the following command to check for the installation status:dpkg -l | grep hplipsudo apt update
sudo apt install --reinstall hplip hplip-guisudo systemctl restart cupsVerifying Driver Compatibility
Kubuntu 24.04 uses a newer version of CUPS than previous releases. Sometimes, the default driver selected during automatic detection may be generic rather than specific to the HP model. When you add the printer, look for a driver option labeled "HP OfficeJet Pro 8620" or use the HPLIP wizard if available. You can launch the HPLIP GUI tool from the terminal to manually configure the printer if the graphical interface fails to find it:hp-setuphp-plugin package is also installed. These plugins handle proprietary features such as fax functionality or specific ink level monitoring, which are essential for full operation of the OfficeJet series.
Common Pitfalls and Checks
One common mistake is assuming that removing and reinstalling the printer queue via the GUI is sufficient. Without restarting the underlying CUPS daemon, the old broken state may persist. Always perform the service restart after any major package changes. Additionally, check your firewall settings if the printer is network-connected. Although less likely to cause immediate disappearance after a CUPS update, blocked ports can prevent the discovery protocol from functioning. Ensure that port 631 (IPP) is allowed through the firewall if you are using network printing. For users experiencing similar driver mismatches with other HP devices, understanding how generic drivers interact with specific hardware can be helpful. Referencing guides on Mismatched Network Printer Drivers can provide context on why generic solutions often fail with specialized hardware like plotters or complex multifunction printers, reinforcing the need for vendor-specific drivers like HPLIP.Frequently Asked Questions
Why did my printer disappear only after updating CUPS?
Updating CUPS often triggers a configuration reload that can invalidate existing printer queues if the associated drivers are not compatible with the new library versions. Restarting the service forces the system to rebuild its device list based on the currently installed drivers.Is it safe to remove the printer and add it again?
Yes, removing the printer queue and adding it back is a standard troubleshooting step. However, you must ensure that the HPLIP package is correctly installed before doing so, otherwise the system will lack the necessary backend to communicate with the device.What if hp-setup cannot find my printer?
If the HPLIP setup tool fails to detect the printer, verify the physical connection. For USB devices, try a different port. For network devices, ensure the printer is powered on and reachable via IP address. You may also need to runhp-info to diagnose communication errors.