Unable to install Startup Disk Creator as download failed: E: http://cn.archive.ubuntu.com/ubuntu bionic/main amd64 usb-creator-gtk amd64 0.3.5 is not (yet) available (Unsupported proxy configured:

  • 1. Please describe how you tried to install usb-creator-gtk, the command you used; 2. Can you install other programs, or update & upgrade your Ubuntu? -- 3. Maybe there is a problem with your connection via the internet (if you must connect via a proxy). – sudodus Mar 11 '19 at 15:13

I faced the same problem.

Try to manually install it on command line sudo apt-get install usb-creator-gtk. The application is installed and you can find it on "Show Applications", or manually execute it via usb-creator-gtk.

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