FYI: I pinged the @KdeNeon team via twitter: https://twitter.com/nnidii/status/812993999283875841 - I assume they just didn't see the issue yet, as it's still unconfirmed.

I encounter this issue today after my kde neon updated yesterday.
I found a fix for me in reddit for ubuntu based user

below is what I need to do in <initramfs> ...

at the cmd prompt
>cd dev
>ls sda*
sda1 sda2 sda3
>fsck sda1
"mine is ok , no error"
>fsck sda2
"loads of error, i have to press "y" multiple times when ask whether to fix or not"

>fsck sda3
"mine ok, no error"

>exit
"continue booting to kde neon"

i hope this help:)