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This question already has an answer here:

Is there an elementary os keyboard equivalent to windows ctlr+alt+del that would launch a task manager, process list, ability to set affinity, priority, kill a proces,monitor memory and cpu loads, + performance. Or which ubuntu/software task manager can I install that is not going to break anything?

marked as duplicate by Daniel Foré, bigbang, Lewis Goddard Jan 30 '16 at 12:54

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Are you comfortable to use terminal (CLI)? – Ravan Nov 14 '15 at 8:10
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    @jmarkus: As you're a reputation 11 user: If one of the answers below helped you, don't forget to click the grey at the left of its text, which means Yes, this answer is valid! ;-) – Fabby Nov 15 '15 at 1:54
  • Fabby - glad you pointed out this oversight on my part. I ticked all three responses, but it seems only one will stick. All were helpful. Any one of the three options work, and I have installed all three. I love efficiency and htop seems to have won that title, but for gui system monitor seems best. YMMV – jmarkus Nov 15 '15 at 19:23
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elementary OS doesn't ship with a system monitor by default. I would recommend installing GNOME System Monitor from Software Center:

GNOME System Monitor

  • sorry, @Daniel why are you avoiding to give terminal command sudo apt-get install gnome-system-monitor. Just curious to know :) – Ravan Nov 14 '15 at 8:15
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    Hey @Ravan this kind of discussion is not really appropriate for comments on an answer; it would be better suited to meta. But to answer your question, I don't think it's generally a good idea to condition new users to enter Terminal commands from the Internet. In fact, Terminal explicitly warns against it when you try. This is how a lot of people break their installs. Terminal is a developer's tool and isn't required to perform tasks like installing new apps. – Daniel Foré Nov 14 '15 at 19:36
  • thank you =) @DanielFore, I will post on meta, please answer :) I understand your point. – Ravan Nov 15 '15 at 1:11
  • I request you please don't DV for CLI answers, (regarding htop), I clearly mentioned that is CLI. – Ravan Nov 15 '15 at 1:14
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If you want to use CLI, you can use htop.

Installation:

  1. From Software Center

Or

  1. From terminal:

    sudo apt-get install htop
    

To start htop you have to run htop in terminal.

It can list all the processes with CPU/RAM usage, Overall CPU/RAM usage and more. It can also kill a process. You have to use up and down arrow keys to navigate.

Imgur

  • Hey - that is slick! I think I'll make a shortcut to htop – jmarkus Nov 14 '15 at 16:44
  • If your computer is being slowed down by something, and you need a shortcut to get to it, you can switch to a terminal with Ctrl+Alt+F1 (or F1-F6), and switch back with Ctrl+Alt+F7 (which is the terminal that the OS's visuals/GUI, the X Window System server, uses). – Ben J Oct 20 '18 at 3:52
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One of the GUI-based task manager is LXTask

  • Lightweight, simple

  • Monitors processes

  • Can kill processes

  • Real GUI

Installation:

  1. From Software Center

Or

  1. From terminal:(If you are comfortable with terminal)

    sudo apt-get install lxtask
    

Imgur

  • It starts via Ctrl+Alt+Del (mentioned in main page), (I have not tested to start using this shortcut since my keyboard Del key not working ) – Ravan Nov 14 '15 at 8:20
  • Installed both, and they seem pretty good. I would like a keystroke combo to launch one of them - should the plank become unresponsive. (It has due to high cpu usage of gala, but I think I have that solved now) Is there a way to assign ctrl+alt+del to launching Gnome system monitor, or lxtask? – jmarkus Nov 14 '15 at 15:40
  • yes =) @jmarkus let me try :) – Ravan Nov 14 '15 at 15:43
  • @jmarkus you can try this – Ravan Nov 14 '15 at 15:56
  • Worked great for creating another shortcut for the terminal. But for sytem monitor the terminal is saying this ** (gnome-system-monitor:6378): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-GKMKspk4te: Connection refused ** (gnome-system-monitor:6378): WARNING **: SELinux was found but is not enabled. – jmarkus Nov 14 '15 at 16:27

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