Comment 10 for bug 1893818

So I tried now a 20.04.1 installation but upgraded to multipath-tools (incl. dependencies) from groovy.
It's obviously a bit ugly to upgrade to multipath-tools from groovy in a focal install, since further packages are pulled in and services need to be restarted (which didn't successfully work on first try) etc. -- anyway, finally I was able to proceed with the installation and it looks like it failed in a similar way compared to a groovy installation:
" 2020-10-09 13:06:10,740 ERROR root:39 finish: subiquity/Filesystem/_probe/probe_once: FAIL: Invalid dep_id (partition-sda1) not in storage config"

For the steps I took see the attached file - and /var/log and /var/crash in the attached tgz in the next comment.
(Please notice that several ui crash files are in /var/crash - this is only because I restarted the installer - but the block-probe-fail crash files are there, too.)