Comment 9 for bug 1580308

I got it [1] now also for the first time when doing apt upgrade and it is pretty scary when considering that /dev/sda3 is the root folder [2].

[1]
...
Setting up update-manager-core (1:17.04.8) ...
Setting up update-manager (1:17.04.8) ...
Processing triggers for libc-bin (2.24-9ubuntu2.2) ...
Processing triggers for initramfs-tools (0.125ubuntu9) ...
update-initramfs: Generating /boot/initrd.img-4.11.8-041108-generic
cryptsetup: WARNING: failed to detect canonical device of /dev/sda3
cryptsetup: WARNING: could not determine root device from /etc/fstab

[2]
df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 16353300 0 16353300 0% /dev
tmpfs 3276344 108148 3168196 4% /run
/dev/sda3 51343840 16054812 32651204 33% /
tmpfs 16381712 700604 15681108 5% /dev/shm
tmpfs 5120 4 5116 1% /run/lock
tmpfs 16381712 0 16381712 0% /sys/fs/cgroup
/dev/loop0 85120 85120 0 100% /snap/core/3017
/dev/loop2 83456 83456 0 100% /snap/core/2898
/dev/sda1 523248 1176 522072 1% /boot/efi
/dev/sda4 419291016 332865984 86408648 80% /home
tmpfs 3276340 64 3276276 1% /run/user/1000
/home/me/.Private 419291016 332865984 86408648 80% /home/me
/dev/loop3 85120 85120 0 100% /snap/core/3247