[Bug 1890959] [NEW] Unable to install Xubuntu from live USB

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I copied xubuntu-20.04.1-desktop-amd64.iso to a USB using usb-creator-
gtk inside Lubuntu 18.04.5. I was able to boot into the Xubuntu live USB
and run many of the applications. When I then installed Xubuntu, the
process crashed every time during "copying files" after entering my
name, username and password.

The error message was about errors in CD/DVD (but checks at the live USB
boot screen reported no errors) and suggested slowing down the write
process (not possible with USB) or trying at a cooler temperature. The
same problem occurred when I went straight to "Install Xubuntu" without
"Try Xubuntu". The crash has been captured and the log files sent by
Apport.

I tried different USB drives and different versions of Ubuntu. These all produced the same error:
xubuntu-20.04.1-desktop-amd64.iso
xubuntu-20.04-desktop-amd64.iso
ubuntu-20.04.1-desktop-amd64.iso

Using the same USB drive, I was successful when installing these (so it was not because of a faulty USB drive):
lubuntu-20.04.1-desktop-amd64.iso
ubuntu-20.04.1-live-server-amd64.iso
debian-10.5.0-amd64-xfce-CD-1.iso

In the end, I found a workaround by using the "minimal CD" from
"http://archive.ubuntu.com/ubuntu/dists/focal/main/installer-
amd64/current/legacy-images/netboot/mini.iso" and select a full Xubuntu
desktop during installation.

Two comments:
1. How can I locate the bug and help you investigate this? It was difficult to get any information when the system crashed in the middle of an installation (cannot use CTRL+ALT+T to get a terminal).
2. Can a link to the "minimal CD" be placed at a more prominent place on your website? It was very difficult to find. A minimal CD is also a useful strategy for older computers.

Thank you for your help.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Unable to install Xubuntu from live USB
https://bugs.launchpad.net/bugs/1890959
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