I installed kno 4.0 on my drive /dev/hdb16 and it went well.
When I 1st booted with grub, I get message "give password for maintenance"
or enter ctrl d for normal startup. I enter ctrl d and kno 4.0 starts up normally.
The next day, I start kno 4.0 and I keep geting "hdb: lost interupt" and I have to reboot.
I have kno 3.6 installed on hdb10 so my hdb is ok. I have other distros installed on hdb and they all work ok