There is a recent Etcher.io bug in Linux https://github.com/resin-io/etcher/issues/1955  causing errors writing images. While we're hoping to release Etcher 1.3.1 soon, but as a temporary workaround you can do to manually downgrade to 1.2.1 :   sudo apt-get remove etcher-electron sudo apt-get update sudo apt-get install etcher-electron