Etcher can't perceives usb drive

when I try to flash ubuntu on my removable disk it doesn’t perceives that. what should i do?

Hi and welcome!
Could you please tell us:

  • Etcher version you’re running
  • OS type and version (e.g. ubuntu 14.04)
  • Output of the devtools console (ctrl + shift + i then focus the Console tab, copy+paste here)

Could you please also share the output of lsblk --bytes --all --json --paths --output-all ?