Latest ISO 20.02.2020 broken. Crash every time when "update-grub".
Previous build 13 February installs nice, but i don't have it anymore.
Tried re-download official .iso from 2 PCs... (did not test this issue on second PC)
I'm perfectly installs Neon on main PC even year ago, but have issue with latest .iso.
Flash on USB from Win10 using Rufus and from Ubuntu using GNOME Disks "recovery image".
Every try to install, i got installer crash. I have only one HDD and install in auto - full clean mode.

P.S. Now i'm downloaded and temporary installed latest build Ubuntu 20.04.
But will be back on NEON when the problem is solved.
20.04 already have xOrg 1.20.7/Mesa 20.0.0/nVidia 440.59 and confirmed GNOME 3.36 in the coming month. (now installed GNOME 3.35.9x)
New GNOME and all system works perfectly smooth with 1660Ti.

I have the same issue, there is now a new release with 27 number did you tried this ISO image? or the same problem ?

Same issue here. Using whatever's in the "user" download.

neon-user-20200227-1119.iso also have this problem.
Installer just crashes.
I'm on Arch Linux now.

neon-user-20200302-2231.iso nice installed, problem solved.
I hope Neon iso's will continue updating frequently on the site, and give maximum lightweight and clear out of box experience.
But it’s very good that proprietary nVidia driver are installed out of box.
I'm waiting 440.64 for my ASUS ROG-STRIX-GTX1660TI-O6G-GAMING
I know, when they will be in Ubuntu repositories)))
Sorry, if my english bad. Just from Russia, Moscow.