Public bug reported: I just upgraded from 18.04, where this wasn't a problem. On 20.04, whenever I try to scan a document with simple-scan while ippusbxd or ipp-usb are running (I tried with both) it will fail to connect to the printer and show the following message in a popup: "Failed to scan: Unable to connect to scanner".
I'm not sure what causes this, but whenever I kill ippusbxd (sudo killall -9 ippusbxd) scanning works again. That breaks printing for me though, so now I have to do this awkward dance of killing and restarting ippusbxd to scan or print. I've found quite a bit of people having comparable problems with printers on Ubuntu 20.04 (see https://askubuntu.com/questions/1233521/printer-problems-after- installing-ubuntu-20-04 and https://askubuntu.com/questions/1258462/ubuntu-20-04-simple-scan-does- not-detect-scanner ) but this is the only workardoung for scanning that worked for me. Some people online recommended replacing ippusbxd with ipp-usb from https://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04/amd64/ but ipp-usb caused the same problem for me. My printer is a HP DeskJet 2630 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: simple-scan 3.36.3-0ubuntu0.20.04.0 ProcVersionSignature: Ubuntu 5.4.0-91.102-generic 5.4.151 Uname: Linux 5.4.0-91-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: XFCE Date: Sun Dec 5 21:34:09 2021 EcryptfsInUse: Yes InstallationDate: Installed on 2017-10-09 (1518 days ago) InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) MachineType: Dell Inc. XPS 15 9560 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-91-generic root=UUID=81684bb6-dd57-423d-ad09-8d26ed3e4a06 ro nouveau.modeset=0 quiet splash pci=nommconf vt.handoff=7 SourcePackage: simple-scan UpgradeStatus: Upgraded to focal on 2021-11-14 (21 days ago) dmi.bios.date: 08/23/2017 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.4.0 dmi.board.name: 05FFDN dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.4.0:bd08/23/2017:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 9560 dmi.product.sku: 07BE dmi.sys.vendor: Dell Inc. ** Affects: simple-scan (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal ** Attachment added: "error as shown simple-scan while ippusbxd is running" https://bugs.launchpad.net/bugs/1953260/+attachment/5545475/+files/simple-scan-error.png -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to simple-scan in Ubuntu. https://bugs.launchpad.net/bugs/1953260 Title: simple-scan fails to connect to scanner while ippusbxd or ipp-usb are running Status in simple-scan package in Ubuntu: New Bug description: I just upgraded from 18.04, where this wasn't a problem. On 20.04, whenever I try to scan a document with simple-scan while ippusbxd or ipp-usb are running (I tried with both) it will fail to connect to the printer and show the following message in a popup: "Failed to scan: Unable to connect to scanner". I'm not sure what causes this, but whenever I kill ippusbxd (sudo killall -9 ippusbxd) scanning works again. That breaks printing for me though, so now I have to do this awkward dance of killing and restarting ippusbxd to scan or print. I've found quite a bit of people having comparable problems with printers on Ubuntu 20.04 (see https://askubuntu.com/questions/1233521/printer-problems-after- installing-ubuntu-20-04 and https://askubuntu.com/questions/1258462/ubuntu-20-04-simple-scan-does- not-detect-scanner ) but this is the only workardoung for scanning that worked for me. Some people online recommended replacing ippusbxd with ipp-usb from https://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04/amd64/ but ipp-usb caused the same problem for me. My printer is a HP DeskJet 2630 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: simple-scan 3.36.3-0ubuntu0.20.04.0 ProcVersionSignature: Ubuntu 5.4.0-91.102-generic 5.4.151 Uname: Linux 5.4.0-91-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: XFCE Date: Sun Dec 5 21:34:09 2021 EcryptfsInUse: Yes InstallationDate: Installed on 2017-10-09 (1518 days ago) InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) MachineType: Dell Inc. XPS 15 9560 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-91-generic root=UUID=81684bb6-dd57-423d-ad09-8d26ed3e4a06 ro nouveau.modeset=0 quiet splash pci=nommconf vt.handoff=7 SourcePackage: simple-scan UpgradeStatus: Upgraded to focal on 2021-11-14 (21 days ago) dmi.bios.date: 08/23/2017 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.4.0 dmi.board.name: 05FFDN dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.4.0:bd08/23/2017:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 9560 dmi.product.sku: 07BE dmi.sys.vendor: Dell Inc. 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