In the select drive installation screen it says /dev/nvmw0n1-256Gb intel ssd but at the far right next to it, it says 174.0 GB does that mean how much free space I can use for Ubuntu?
In the select drive installation screen it says /dev/nvmw0n1-256Gb intel ssd but at the far right next to it, it says 174.0 GB does that mean how much free space I can use for Ubuntu?
The 256 GB marketed size is the physical storage capacity of the drive, is not the same as the actual available space once installed since the manufacturer use space on the disk itself to store drivers and other required software.
I find odd however, that the difference is that big, we are talking of ~81 GB of used space, do you have another OS or files installed in your SSD drive? if you want to use the entirety (or as much as possible) of the disk, you will have to format and delete any existing partitions.