A sad day for Linux Lite on my Asus laptop, but can it be fixed ?

[m654321]

I'm not sure about the flags as I always used the full erase function.

Yes, presumably with the full erase (autoinstall) method, any flags that are needed are automatically set up for you. I hadn't thought of that - many thanks  8)
The only thing is, it'll probably install a '/swap' partition (which I don't need), but I guess I can erase that.

For the swap, I am somewhat noob to Linux but I know that in Windows some function NEED a swap (page file), maybe same goes for Linux even with lots of RAM.

I think where /swap is used on SSDs, even where the level of RAM is more than adequate, it's normally used for the 'hibernate' or 'suspend' function. Basically, you can close the lid of your laptop, without having to shut everything down, and resume again later.