From forums/3180:

Trying to use Etcher CLI on an old mac to install Ubuntu because the Etcher GUI is not supported on my version of OS X (10.6.8). Any ideas how to resolve?

$ sudo etcher -d /dev/disk2s1 ~/Downloads/ubuntu-18.04-desktop-amd64.iso
? This will erase the selected drive. Are you sure? Yes
/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:129
const layout = list.AllDisksAndPartitions.find((disk) => {
^

TypeError: Cannot read property ‘find’ of undefined
at devices.forEach (/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:129:46)
at Array.forEach (native)
at setMountpoints (/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:128:11)
at asyncMap (/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:169:7)
at next (/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:79:7)
at ChildProcess.childProcess.spawn.on.on.e (/snapshot/etcher-cli-1.4.4-darwin-x64-app/node_modules/drivelist/lib/diskutil.js:51:7)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)