According to the product page the default hardware has only one CPU with 2 cores, and 2GB of RAM. Did you upgrade either the CPU or memory? Also, a HDD drive will be slower than SDD or nvme.
CPU
        CPU Model 	AMD Ryzen R1600
	CPU Quantity 	1
	CPU Core 	2
	CPU Architecture 	64-bit
	CPU Frequency 	2.6 (base) / 3.1 (turbo) GHz
	Hardware Encryption Engine 	
Memory
	System Memory 	2 GB DDR4 ECC SODIMM
	Memory Module Pre-installed 	2 GB (2 GB x 1)
	Total Memory Slots 	2
	Maximum Memory Capacity 	32 GB (16 GB x 2) 
Although, there is always the possibility that a user is installing Solus on an older / less robust machine. IMO the installer shouldn't fail here.