But then my experience is somewhat limited I'm also utterly confused with your report that with a single different 4Gb RAM stick you still get 2Gb. None of earlier versions I've worked with over years ever exhibited anything remotely similar to this weird behavior. Yes your Ubuntu is not the latest 20.04 but I don't think that matters. Generally I think upgrading BIOS is still advisable. iso on a USB stick (burning a CD as a last resort if nothing else works) but I haven't done it myself yet so I kept silent on that one. I'm sure there is some way involving putting an. I have seen your question on the best way to upgrade BIOS. And I don't think this something is in Linux. I find it utterly suspicious that the machine doesn't boot with just one RAM stick and doesn't beep either. What is not normal is that you don't have close to 4Gb. So it's probably normal not to see a multiple of 1024 MiB there. I expected to see 16 * 1024 = 16384 but perhaps some RAM is allocated for Intel video? Or for some other purposes. I've also noticed my system with 16Gb RAM reports 'MiB Mem :15960.4 total'. 'top' is the right way to check how much RAM your system has got I've also found 'About' section in 'Settings' in 'Ubuntu', but I always reach out for 'top' myself. Maybe I should try to reinstall system using some specific manual settings? I choosed auto settings during installation. top command tells me that I have 1808 MiB Mem and thop in it's turn gives a bit different data - 1.77 G. You'll probably ask me a question, how I decided that my laptop sees only a half of installed memory? I am not a power user, so I just don't know better way to figure this out than run a commands like htop and top. Here literally a part of the output concerning RAM.

In reprly to the MIke's comment I would add that dmidecode actually shows both modules of RAM. Thanks for your answers guys, i very appreciate.

Thinkpad w530 ram slots