Tou're going to find the report from "sudo lshw" a bit overwhelming at first; it will tell you much more than you want to know at this stage of your learning curve!
For the details of your RAM, look for something similar to this:
Code:
*-memory:0
description: System Memory
physical id: 10
slot: System board or motherboard
size: 3GiB
*-bank:0
description: DIMM DDR2 800 MHz (1.2 ns)
product: HYMP112U64CP8-S6
vendor: AD00000000000000
physical id: 0
serial: None
slot: A0
size: 1GiB
width: 64 bits
clock: 800MHz (1.2ns)
*-bank:1
description: DIMM DDR2 800 MHz (1.2 ns)
product: M3 78T5663QZ3-CF7
vendor: CE00000000000000
physical id: 1
serial: None
slot: A1
size: 2GiB
width: 64 bits
clock: 800MHz (1.2ns)
It will be near the start of the report, and the details will differ a lot, because this report is from my machine here with 3 GB of RAM. However, you should have at least one "bank" line, and it should contain a "description" line at the minimum. The key thing in this description is the "DDR2 800 MHz" part, which says that my two memory sticks are the 800-MHz DDR2 variety. With only 256 MB in your system, yours are likely to be either PC-100, PC-133, or DDR. The various types are NOT interchangeable, so this is essential info before you go shopping for additional RAM.
Also I didn't see anyone warn you that when you type your password as requested by "sudo" you won't see any indication at all that it's being accepted, unlike most other places where the system asks for your password. That's a common complaint for newcomers; we all expect some sort of feedback that the keys are being recognized! Worry not, just type it in carefully and things will work.
And welcome to this great world of promise and freedom. Don't worry much about breaking the system while you're learning; we've all done it, most of us multiple times!
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