How to check ram in ubuntu

There are a few options:

1. LSPCI

will show you most of your hardware in a nice quick way.

It has varying levels of verbosity so you can get more information out of it with and flags if you want it. The argument is a good way to find out which kernel driver a piece of hardware is using.

How to check processor in ubuntu

will let you simply know the hardware ID which is great for searching.

But it is only a very simple, quick way of getting a list of hardware. I often ask people to post the output of it here when trying to identify their wireless hardware.

It's great for things like that.

It doesn't show USB hardware other than the USB busses.

Here are three real world examples:

Graphics

Audio

Networking

2. LSUSB

is like but for USB devices.

How to know system configuration in ubuntu using terminal

Similar functionality with similar verbosity options. Good if you want to know what's plugged in.

3. LSHW

will give you a very comprehensive list of hardware and settings.

It gives you so much information, I suggest you pipe it through or output it to a file and open that in something you can move around in:

Of course

how to check system information in ubuntu 20.04

how to check system hardware configuration in ubuntu