Justin Not a Quadro in my case, sorry for thread-hijacking 
Thought that my case is pretty similar...
It's a Nvidia RTX 2070 Super, specifically a Gigabyte RTX 2070 Super Aorus Gaming OC
Black screen flashing white cursor top left on live boot. Nvidia GPU
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chiltepin Interesting as Zeb has a 2080Ti and he was able to install the drivers, then restart lightdm and get the GUI.
Edit: Maybe the super cards are different and not quite supported by the drivers yet. You tried the beta but did you try the developer drivers? I think they're even more experimental.
Justin Thank you, I didn't know about the dev drivers. But it has the same effect, no working GUI with eopkg it nvidia-developer-driver-current.
There is a nvidia-persistence service, which seems to be the main problem. Journal says, the service is unable to write to /dev/nvidia*, thus fails to start. I tried to set the group via chown, even tried chmod 777 with no success.
If it's interesting for you, I can upload some photos I made from the journal.
8 months later
Any updates on this? I am also having the same issue, with not way to get past the terminal into the gui to install Solus. I am on the X570 platform with a Ryzen 3900x and a GTX 1080, other various threads with this issue claim you can fix it by installing nvidia drivers, but as @chiltepin has mentioned that has no effect, and neither does booting with nomodeset. This is an ongoing problem with Solus that needs to be addressed as it is unusable currently. I can provide logs or whatever devs need if anyone can take a look at this.
It is also weird, my solid live usb crashes 1st time due to nouveau error, second time I booted it it booted fine without nomodeset and I was able to install it, but now I am getting the nouveau crash every time I boot both the OS and the live USB.
nomodeset boots to the cursor, but Alt+f2 doesn't work, it won't open console, it stays at black screen
NKSHV Why don't you install the nvidia driver instead of using nouveau?
I found a solution: when it gives you the initial boot menu with solus and reboot to firmware, press e to edit solus entry, delete "quiet splash" and replace it with "noveau.nomodeset=0" and press enter
kaktuspalme I can't boot the system, how do I install the driver??
NKSHV What gpu do you have? Can you get to the tty now with nomodeset? Then you can install it using the terminal.
Propably "sudo eopkg it nvidia-glx-driver-current" should do the trick, if your gpu is new enough and you use the current kernel.
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kaktuspalme I have gtx 1650. As I said I can't access TTY with just nomodeset, but with "nouveau.nomodeset=0" the system boots properly. However now I've encountered this issue. https://discuss.getsol.us/d/3365-nvidia-glx-driver-common-problem
I can't use "sudo eopkg it nvidia-glx-driver-current" as it shows "could not fetch destination file from "https://mirrors.rit.edu/solus/packages/shannon/n/nvidia-glx-driver/nvidia-glx-driver-common-440.44-329-1-x86_64.eopkg": [Errno 14] HTTPS Error 404 - Not Found
If the nvidia driver is in the database but missing from the repo, something is definitely wrong with solus drivers database and it might be why solus can't boot for so many people with nvidia gpus
NKSHV If the nvidia driver is in the database but missing from the repo, something is definitely wrong with solus drivers database and it might be why solus can't boot for so many people with nvidia gpus
It's not found because it doesn't exist anymore, we trim older packages. You need to make sure you have a fully up-to-date system (run sudo eopkg up).
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JoshStrobl yes, upgrading did the trick. However after upgrading and installing the driver, solus boots into the flickering cursor again, but now I can't set it to nouveau nomodeset because it is not live usb and there are no entries where I can press e. However now ctrl +f2 opens terminal. That didn't help because starting and restarting lightdm does nothing. Seems like solus is just broken for nvidia gpus.
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It seems to work now. I removed the nvidia driver from the ctrl f2 terminal by typing
sudo eopkg rm nvidia-glx-driver nvidia-glx-driver-common nvidia-glx-driver-32bit
sudo linux-driver-management configure gputhen reboot.
After reboot it worked, doflicky showed that it found drivers (it didn't show that before) and those drivers worked. The package is the same package "nvidia-glx-driver", something must have been wrong with it before.
NKSHV Yeahh I mislead you a bit there. Then you are probably not on linux-current and therefore that driver didn't work.
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kaktuspalme I don't know what "linux-current" is, but I've downloaded solus budgie iso today from https://getsol.us/download/ and flashed using rufus. Whatever this linux-current is, it was included in the official solus budgie download
NKSHV I don't know what "linux-current" is
There are at least two repositories -- stable and unstable. Packages are first tested in unstable, and then after confirmed to be working well, they're moved into stable. The newest kernel -- that can be tested and working without significant issues -- is called linux-current and is released via stable, as well as whatever is adopted as the LTS (earlier Long Term Support) kernel.
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Having the same issue here. On a desktop setup with a dedicated GPU (RTX 2080Ti) and X570, trying to install Solus on my Samsung 970 Evo Plus SSD.
Booting the live USB without using nomodeset results in green and purple lines while the system audibly starts in the background as I hear the boot sound. Using nomodeset gives me a black screen with the flashing white cursor and opening the terminal, logging in as root, using eopkg up, followed by eopkg install nvidia-glx-driver-current and then systemctl restart lightdm results in the flashing cursor again. There's no audible boot sound during this whole sequence of events as well.
I'd appreciate any solutions if anyone has any, would love to get Solus running on my setup.