I have succeeded doing what you try to do, when I booted with the two boot options 'toram' and 'nopersistent' (both at the same boot) with the other Ubuntu flavours that use Ubiquity.
Installing with Calamares works for me (to install Lubuntu 20.04 LTS) without the boot option 'toram', for example with the default boot options and also with the extra boot option 'persistent'. But it fals for me too, when I use the boot option 'toram'. My question is to you GT: Why do you want this? The only reason I can think of is to install into the same drive as you were booting from. Maybe this is another manifestation of the bug I reported at https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1873950 See also the following link, https://help.ubuntu.com/community/mkusb/persistent#Installing_- _using_the_Install_icon_on_the_desktop -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876950 Title: Lubuntu Calamares install fails if loop0 already in use To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/calamares-settings-ubuntu/+bug/1876950/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
