Setup: a PC with working linux (Ubuntu in my case), one USB drive. No other removable media available (i.e. no CD/DVD drive, no SD card, no other USB drive...).
Task: install a linux (Fedora in my case) on the USB drive (without modifying the system installed on the PC).
Normally I would use another removable medium, set up a live image there, boot it and install on the desired USB drive from there but there is only a single USB drive is available. Is it possible to achieve this? If it is, how?