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In my case this showed that /dev/sda was the 32GB card. It will take a little time to extract the 4GB image. Navigate to the Downloads folder (or whichever folder you used), identify the file, right click on it and choose extract from the options. You should be able to do that in your file manager. The image is compressed so needs to be unzipped. I'll post clearer instructions and update the screenshots soon. Note: If using SD Card Copier on the Raspberry Pi or Gnome Discs you do not have to unzip the file first so the next bit is out of date now. Once you have opened the website in a browser click on and save the file on your computer. On your computer look for the latest image on Get and extract the Ubuntu Touch (UT) image Raspberry Pi 3B+ and a good power supply, Micro SD card (8-32GB), card reader in desktop or laptop computer (or a Raspberry Pi running Linux), USB keyboard and mouse, HDMI monitor/TV and cable, Ethernet connection and cable.
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It is also possible from Microsoft Windows or Macs – I have neither but if anyone wants to add instructions for them please do so. I've previously used Ubuntu 18:04 on an old desktop computer. Feel free to use whatever software you are used to or you prefer. More or less the same procedure will work with most Linux desktop distributions. I've used Raspian on the Raspberry Pi 4 to prepare the image.
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