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I have Ubuntu 20.04 and I use system monitor to see cpu and ram activity but it doesn't show the harddisk activity like the ram utilization is showed in graph and its reading and writing speed so how to enable it?

Piyush Mhatre
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The gnome shell extension called gnome-shell-extension-system-monitor can put a real-time graph into the top panel.

You need to install the Gnome Tweaks app along with the extension:

sudo apt install gnome-tweaks gnome-shell-extension-system-monitor

The newly installed Tweaks app will offer a user interface for managing shell extensions.

Shell extensions need to be enabled in general (look for the "Extensions" tab in the Tweaks app window), and then the "System Monitor" can be enabled in the list of extensions.

It's highly configurable. Maybe the "Disks" graph is not enabled by default, but via the preferences, it can be enabled.

To take full effect, might need logging out and back in.

Levente
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    How to see extionsions? @Levente – Piyush Mhatre Jan 09 '21 at 07:52
  • Please clarify. What steps did you do, and where did you get stuck? – Levente Jan 09 '21 at 07:54
  • Yes I did the command given by you and I will logout and login later but don't know where to look for the extensions tab@Levente – Piyush Mhatre Jan 09 '21 at 07:57
  • Open the "Tweaks" app that just got installed. It has an "Extensions" tab. I also updated my answer. – Levente Jan 09 '21 at 07:58
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    Ok Thankyou I found it and I enabled all the options and also selected the preferences in system monitor and the disk write and disk read is already enabled but not showing its graph @Levente – Piyush Mhatre Jan 09 '21 at 08:04
  • Maybe now comes the part with the log out / log in. – Levente Jan 09 '21 at 08:07
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    Sorry but a last question please will it give a big impact on the performance. @Levente – Piyush Mhatre Jan 09 '21 at 08:27
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    I use it since one month, and did not experience anything of note. To me it seems it's stable and well written. Furthermore, the preferences make it possible to adjust refresh rates to each graphs. The more sparse the refresh rate, the smaller the impact on the system. – Levente Jan 09 '21 at 08:32
  • I installed gnome-shell-extension-system-monitor, but I don't see a "System Monitor" in the Extensions tab of Tweaks, even after reboot. I'm using Gnome 3.30.2 on Debian 10. – Rodrigo Nov 16 '21 at 13:54