I have same error with HP Deskjet 2630 and simple-scan 3.38.1-1 on Ubuntu 21.04 was ok before some upgrades.
-- 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/1879024 Title: Error message : "Failed to scan - unable to connect to scanner" when using simple-scan Status in simple-scan package in Ubuntu: Confirmed Bug description: 1) System and program information: I am using Ubuntu 20.04 LTS and am trying to use the brother printer/scanner combo MFC-J5910DW in order to scan documents with simple-scan: simple-scan: Installed: 3.36.0-0ubuntu1 Candidate: 3.36.0-0ubuntu1 Version table: *** 3.36.0-0ubuntu1 500 500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages 100 /var/lib/dpkg/status 2) Description of what I did and what happened: I downloaded and installed the newest scanner driver deb-packages (2 of them) from the official brother web-page and installed them using $ sudo apt-get install ./'sannerdirverfilename'.deb and there was no error message. So I also installed simple-scan from the Ubuntu repository using: $ sudo apt-get install simple-scan This also worked just fine. But when I now try to use simple-scan, it doesn't work. I call the program from the terminal command line: $ simple scan and it opens an interactive window, searches for a scanner and finds the brother scanner. But when I then hit the 'scan' button, I get the error message "Failed to scan - unable to connect to scanner" 3) Error Log for simple-scan: So I used simple-scan with the debug option, and here is the log-file: $ simple-scan --debug [+0,00s] DEBUG: simple-scan.vala:638: Starting simple-scan 3.36.0, PID=7992 [+0,00s] DEBUG: unsetenv() is not thread-safe and should not be used after threads are created [+0,02s] DEBUG: _g_io_module_get_default: Found default implementation dconf (DConfSettingsBackend) for ‘gsettings-backend’ [+0,06s] DEBUG: app-window.vala:1908: Loading state from /home/barbara/.cache/simple-scan/state [+0,06s] DEBUG: app-window.vala:1887: Restoring window to 600x400 pixels [+0,33s] DEBUG: app-window.vala:1983: Saving state to /home/barbara/.cache/simple-scan/state [+6,00s] DEBUG: scanner.vala:1541: sane_init () -> SANE_STATUS_GOOD [+6,00s] DEBUG: scanner.vala:1547: SANE version 1.0.29 [+6,00s] DEBUG: scanner.vala:1608: Requesting redetection of scan devices [+6,00s] DEBUG: scanner.vala:828: Processing request [+6,15s] DEBUG: app-window.vala:1983: Saving state to /home/barbara/.cache/simple-scan/state [+14,91s] DEBUG: scanner.vala:341: sane_get_devices () -> SANE_STATUS_GOOD [+14,91s] DEBUG: scanner.vala:353: Device: name="brother4:bus2;dev2" vendor="Brother" model="MFC-J5910DW" type="USB scanner" [+15,02s] DEBUG: app-window.vala:1983: Saving state to /home/barbara/.cache/simple-scan/state [+41,02s] DEBUG: simple-scan.vala:455: Requesting scan at 150 dpi from device 'brother4:bus2;dev2' [+41,02s] DEBUG: scanner.vala:1676: Scanner.scan ("brother4:bus2;dev2", dpi=150, scan_mode=ScanMode.GRAY, depth=2, type=single, paper_width=0, paper_height=0, brightness=0, contrast=0, delay=3000ms) [+41,02s] DEBUG: scanner.vala:828: Processing request [+41,02s] DEBUG: scanner.vala:889: sane_open ("brother4:bus2;dev2") -> SANE_STATUS_IO_ERROR [+41,02s] WARNING: scanner.vala:893: Unable to open device: Error during device I/O [+41,43s] DEBUG: app-window.vala:1983: Saving state to /home/barbara/.cache/simple-scan/state [+56,27s] DEBUG: app-window.vala:1983: Saving state to /home/barbara/.cache/simple-scan/state [+100,09s] DEBUG: autosave-manager.vala:201: Deleting autosave records [+100,09s] DEBUG: scanner.vala:1704: Stopping scan thread [+100,09s] DEBUG: scanner.vala:828: Processing request [+100,09s] DEBUG: scanner.vala:1715: sane_exit () I have no idea why sane cannot open the I/O device. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: simple-scan 3.36.0-0ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30 Uname: Linux 5.4.0-29-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sat May 16 07:54:46 2020 InstallationDate: Installed on 2020-04-24 (21 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Dell Inc. Latitude E5450 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic root=UUID=2bb62112-1254-42cd-ba84-e3f2edc0d4b2 ro quiet splash vt.handoff=7 SimpleScanLog: SourcePackage: simple-scan UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/30/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A08 dmi.board.name: 0DCPV1 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA08:bd07/30/2015:svnDellInc.:pnLatitudeE5450:pvr:rvnDellInc.:rn0DCPV1:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5450 dmi.product.sku: 062B dmi.sys.vendor: Dell Inc. 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