I am getting the same error.
I am running KDE neon with latest updates.
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:27705 Download the React DevTools for a better development experience: https://fb.me/react-devtoolsYou might need to use a local HTTP server (instead of file://): https://fb.me/react-devtools-faq
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 _____ _ _
| ___| | | |
| |__ | |_ ___| |__ ___ _ __
| __|| __/ __| '_ \ / _ \ '__|
| |___| || (__| | | | __/ |
\____/ \__\___|_| |_|\___|_|
Interested in joining the Etcher team?
Drop us a line at join+etcher@balena.io
Version = 1.5.76, Type = appimage
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:25 GMT+0100 (Central European Standard Time) Application start ({"packageType":"appimage","version":"1.5.76","applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:32 GMT+0100 (Central European Standard Time) Open image selector ({"applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","flashingWorkflowUuid":"0a4a7317-b4d9-41ed-9ac1-68db29076ef5","sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:34 GMT+0100 (Central European Standard Time) Select image ({"image":{"size":4294967296,"name":"lineage-16.0-20191222-UNOFFICIAL-KonstaKANG-rpi3.img","hasMBR":true,"partitions":[{"offset":1048576,"size":134217728,"type":12,"index":1},{"offset":135266304,"size":1073741824,"type":131,"index":2},{"offset":1209008128,"size":268435456,"type":131,"index":3},{"offset":1477443584,"size":2817523712,"type":131,"index":4}],"path":"/home/tobias/Downloads/rpi/lineage-16.0-20191222-UNOFFICIAL-KonstaKANG-rpi3.img","extension":"img","logo":false,"blockMap":false},"applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","flashingWorkflowUuid":"0a4a7317-b4d9-41ed-9ac1-68db29076ef5","sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:38 GMT+0100 (Central European Standard Time) Flashing 0 devices, 0% at null MB/s (total null MB/s) eta in undefineds with 0 failed devices
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:38 GMT+0100 (Central European Standard Time) Flash ({"image":"/home/tobias/Downloads/rpi/lineage-16.0-20191222-UNOFFICIAL-KonstaKANG-rpi3.img","drives":[{"size":63864569856,"isVirtual":false,"enumerator":"lsblk:json","logicalBlockSize":512,"raw":"/dev/sda","error":null,"isReadOnly":false,"displayName":"/dev/sda","blockSize":512,"isSCSI":false,"isRemovable":true,"device":"/dev/sda","busVersion":null,"isSystem":false,"busType":"USB","isCard":null,"isUSB":true,"devicePath":"/dev/disk/by-path/pci-0000:07:00.3-usb-0:6.1.4:1.0-scsi-0:0:0:0","mountpoints":[],"description":"Mass Storage Device","isUAS":null}],"driveCount":1,"uuid":"8dbaa554-22cd-4350-a8a0-2c736c476c30","status":"started","flashInstanceUuid":"8dbaa554-22cd-4350-a8a0-2c736c476c30","unmountOnSuccess":true,"validateWriteOnSuccess":true,"trim":true,"applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","flashingWorkflowUuid":"0a4a7317-b4d9-41ed-9ac1-68db29076ef5","sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Elevating command: /run/user/1000/appimagelauncherfs/0000.AppImage -e require(`${process.env.APPDIR}/resources/app.asar`)
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:38 GMT+0100 (Central European Standard Time) SafeWebview loaded ({"event":{"id":1,"url":"https://assets.balena.io/etcher-featured/index.html?etcher-version=1.5.76&api-version=2&optOutAnalytics=false","method":"GET","timestamp":1581078098270.2551,"resourceType":"mainFrame","ip":"2606:4700:3031::681f:529d","fromCache":false,"statusLine":"HTTP/1.1 200","statusCode":200,"responseHeaders":{"access-control-allow-origin":["*"],"age":["188"],"cache-control":["max-age=600"],"cf-cache-status":["DYNAMIC"],"cf-ray":["56155321f8d063b9-FRA"],"content-encoding":["br"],"content-type":["text/html; charset=utf-8"],"date":["Fri, 07 Feb 2020 12:21:38 GMT"],"expect-ct":["max-age=604800, report-uri=\"https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct\""],"expires":["Thu, 06 Feb 2020 14:12:44 GMT"],"last-modified":["Tue, 21 Jan 2020 17:49:11 GMT"],"server":["cloudflare"],"status":["200"],"vary":["Accept-Encoding"],"via":["1.1 varnish"],"x-cache":["HIT"],"x-cache-hits":["1"],"x-fastly-request-id":["928de9fabbe0498d423463a3cd2aa98ae46faa7a"],"x-github-request-id":["0BA8:5215:1C6F4:24140:5E3C1C84"],"x-proxy-cache":["MISS"],"x-served-by":["cache-fra19180-FRA"],"x-timer":["S1581078098.246638,VS0,VE1"]},"referrer":"","error":"net::OK"},"applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","flashingWorkflowUuid":"0a4a7317-b4d9-41ed-9ac1-68db29076ef5","sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 error Error: Command failed: cd "/home/tobias/Downloads/rpi"; "/usr/bin/pkexec" --disable-internal-agent /bin/bash -c "echo SUDOPROMPT; bash '/tmp/balena-etcher-electron-18049iiGztOLIj7nC.cmd'"
/tmp/balena-etcher-electron-18049iiGztOLIj7nC.cmd: line 77: /run/user/1000/appimagelauncherfs/0000.AppImage: Permission denied
at ChildProcess.exithandler (child_process.js:308)
at ChildProcess.emit (events.js:203)
at maybeClose (internal/child_process.js:1021)
at Socket.<anonymous> (internal/child_process.js:430)
at Socket.emit (events.js:203)
at Pipe.<anonymous> (net.js:588)
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Terminating IPC server
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Flash results {}
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 Fri Feb 07 2020 13:21:40 GMT+0100 (Central European Standard Time) Write failed ({"image":"/home/tobias/Downloads/rpi/lineage-16.0-20191222-UNOFFICIAL-KonstaKANG-rpi3.img","drives":[{"size":63864569856,"isVirtual":false,"enumerator":"lsblk:json","logicalBlockSize":512,"raw":"/dev/sda","error":null,"isReadOnly":false,"displayName":"/dev/sda","blockSize":512,"isSCSI":false,"isRemovable":true,"device":"/dev/sda","busVersion":null,"isSystem":false,"busType":"USB","isCard":null,"isUSB":true,"devicePath":"/dev/disk/by-path/pci-0000:07:00.3-usb-0:6.1.4:1.0-scsi-0:0:0:0","mountpoints":[],"description":"Mass Storage Device","isUAS":null}],"driveCount":1,"uuid":"8dbaa554-22cd-4350-a8a0-2c736c476c30","status":"failed","flashInstanceUuid":"8dbaa554-22cd-4350-a8a0-2c736c476c30","unmountOnSuccess":true,"validateWriteOnSuccess":true,"trim":true,"applicationSessionUuid":"2dc018b3-8ff5-4ad3-ad14-888ec2f7d9aa","flashingWorkflowUuid":"0a4a7317-b4d9-41ed-9ac1-68db29076ef5","error":{"description":"The process error code was 126","report":false},"sample":0.1})
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 {"stack":"Error: The elevated process died unexpectedly\n at createError (file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:1091:19)\n at Object.createUserError (file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:1112:12)\n at file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:5973:30","message":"The elevated process died unexpectedly","description":"The process error code was 126","report":false,"image":"lineage-16.0-20191222-UNOFFICIAL-KonstaKANG-rpi3.img"}
console.<computed> @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58
logException @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/resin-corvus/src/resin-corvus.js:233
flashImageToDrive @ gui.js:5259
async function (async)
flashImageToDrive @ gui.js:5243
tryFlash @ gui.js:5337
callCallback @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:336
wrapped @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:444
invokeGuardedCallbackDev @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:385
invokeGuardedCallback @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:440
invokeGuardedCallbackAndCatchFirstError @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:454
executeDispatch @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:584
executeDispatchesInOrder @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:609
executeDispatchesAndRelease @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:713
executeDispatchesAndReleaseTopLevel @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:722
forEachAccumulated @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:694
runEventsInBatch @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:739
runExtractedPluginEventsInBatch @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:880
handleTopLevel @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:5807
batchedEventUpdates$1 @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:24368
batchedEventUpdates @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:1419
dispatchEventForPluginEventSystem @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:5898
attemptToDispatchEvent @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:6014
dispatchEvent @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:5918
unstable_runWithPriority @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/scheduler/cjs/scheduler.development.js:818
runWithPriority$2 @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:12130
discreteUpdates$1 @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:24384
discreteUpdates @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:1442
dispatchDiscreteEvent @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/react-dom/cjs/react-dom.development.js:5885
wrapped @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:444
/tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58 {"stack":"Error: The writer process ended unexpectedly\n at createError (file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:1091:19)\n at Object.createUserError (file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:1112:12)\n at Server.<anonymous> (file:///tmp/.mount_balena9kYAkM/resources/app.asar/generated/gui.js:5689:30)","message":"The writer process ended unexpectedly","description":"Please try again, and contact the Etcher team if the problem persists","report":false,"code":"ECHILDDIED"}
console.<computed> @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:58
logException @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/resin-corvus/src/resin-corvus.js:233
(anonymous) @ gui.js:3397
wrapped @ /tmp/.mount_balena9kYAkM/resources/app.asar/node_modules/raven-js/dist/raven.js:444
/tmp/.mount_balena9kYAkM/resources/app.asar/lib/assets/icon.png:1 GET file:///tmp/.mount_balena9kYAkM/resources/app.asar/lib/assets/icon.png net::ERR_FILE_NOT_FOUND
I tried the following versions:
1.5.76: fails
1.5.75: fails, same error as 1.5.76
1.5.74: not working, blank window
1.5.73: fails, same error as 1.5.76
1.5.72: fails, same error as 1.5.76
1.5.71: fails, same error as 1.5.76
1.5.70: fails, same error as 1.5.76
1.5.69: fails, same error as 1.5.76
1.5.50: fails, different error message “user did not grant permission”, even though I did
1.5.0: fails, different error message “user did not grant permission”, even though I did
1.3.1: fails, no conclusive error message