Does Ubuntu 14.04 have its own 'Task Manager'? Like the one in Windows, where you would check what program is using how much and such.
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You can use top.
Just open a terminal enter top command and it will show you which process is consuming how much Memory and CPU. Visit the link it will really help you
12-Top-commands
Hussain K
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Open 'System Monitor' application ; it's very similar to task manager in Windows.
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The nice thing about the Task Manager in Windows is that you can use a keyboard shortcut to bring it up, even if the computer is frozen.
The System Monitor in Ubuntu is accessible from the Dash: click on the Dash and type “System” and it should come up. This, however, is fairly slow: it involves the graphics-heavy Dash and a search through installed programs and files.
As another answer points out, it may be quicker (and more portable to different versions of Ubuntu), to open the System Monitor from the terminal: just type the command gnome-system-monitor. (The Terminal itself can be opened from the Dash, or by the keyboard shortcut Ctrl+Alt+T.)
However, the best option is to create a new keyboard shortcut. This option is available from System Settings → Keyboard → Shortcuts → Custom Shortcuts. You’ll want to create a new shortcut with the name System Monitor and the command gnome-system-monitor. The key combination you choose is up to you (I went with Ctrl+Alt+End). Now you’ll be able to launch the System Monitor even when the computer is freezing.
TRiG
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use the following command
gnome-system-monitor
if not found then run
sudo apt-get install gnome-system-monitor
Mahendra Garg
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gnome-system-monitoris the name of the package of the "System Monitor" application mentioned in one of the earlier answers. It would be better to suggest a change to it (via the "edit" link below it) instead of posting a separate answer about the same thing. – David Foerster Feb 24 '17 at 12:25