Comment 4 for bug 2017852

I could help myself like this:

#check current linux version
uname -a

--> Linux p15 5.19.0-40-generic #41~22.04.1-Ubuntu

# list installed linux images
apt list --installed| grep linux-image

--> there were some older ones with version 5.15

# remove the old ones
apt remove linux-image-5.15.0-69-generic linux-image-5.15.0-70-generic
apt autoremove

# check states of /boot
df -h
--> /dev/nvme0n1p2 704M 605M 48M 93% /boot

... hmm still not better.

rm /boot/*-5.15*

df -h /boot/

--> /dev/nvme0n1p2 704M 288M 365M 45% /boot

Looks better now.

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I can solve this on my own. But a normal human being (my mother, my sister) can't do this.