I have tried the test iso. I installed as another OS on the stick and
logged in as KDE persistent.
No problems except everything being much slower that I have been used to with PCLos.
Of course, Synaptic said there were no updates, so couldn't try that.
No problem setting locale, adding another user, setting to no automatic boot.
Tried Set up boot system where I had the sda10 error before, and was told
No bootloader found, creating a new configuration.
I then cancelled out of this.