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I always thought this is a simple question and should have a simple answer but it does not. (in Windows it is just Ctrl-Alt-Del)

My ubuntu froze and is furiously working (I can hear the fan). I need to recover what I was doing, so I would like to not reboot.

Please don't post Ctrl-Alt-F1 as a solution. (I have see this so much.) First I don't know what does that do. Second it does nothing here. nothing at all. So it is not a solution.

Any way to open some kind of task controller? or to know the IP of the machine so that I can access it from outside?

KansaiRobot
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    They changed REISUB. You have to fully re-enable it. sudo nano /etc/sysctl.d/10-magic-sysrq.conf Then change the number in line 26 from 176 to 244 i.e. kernel.sysrq = 244 Explanation of REISUB https://askubuntu.com/questions/926461/whats-the-difference-between-the-magic-reisub-reset-and-holding-down-the-power – oldfred Mar 09 '22 at 03:29
  • Your work might be recoverable...but only if you are very lucky. The data you have provided so far suggests a greater probability that your work is not recoverable. A windows-like task manager is generally not needed on Linux desktops because the Linux kernel automatically terminates crashed or misbehaving applications for you. A Linux freeze is instead most often due to a kernel crash. However, we know nothing about your crash beyond your description, so maybe your freeze is different. – user535733 Mar 09 '22 at 04:35
  • CTRL+ALT+F1 won't do anything on newer versions of Ubuntu. You would have to do CTRL+ALT+F4 where you can sign in with your username and password. Here's what it does: it opens a TTY screen (text only) so you can run commands in the terminal. Some commands that might help: sudo htop is like a task manager. See this answer for how to kill processes. To get back to your GUI screen, use CTRL+ALT+F2 or CTRL+ALT+F1 – mchid Mar 09 '22 at 05:36
  • Outside access via ssh isn't going to give you more control than a TTY but you would need to access the TTY to get the local IP. Also, you would have to enable ssh before the problem. However, it might help to use ifconfig to show your local ip before the problem and also set up ssh access in case TTY is also unresponsive in the future. – mchid Mar 09 '22 at 05:38

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