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You might be looking for the [Magic SysRq](https://www.kernel.org/doc/html/v4.11/admin-guide/sysrq.html) feature, which has many functions. One of the most useful is Alt+SysRq+f, which triggers the kernel's out-of-memory process killer.

On Ubuntu, you may need to enable this feature using a [sysctl configuration file](https://linuxconfig.org/how-to-enable-all-sysrq-functions-on-linux). Either enable all Magic SysRq functions with the value `1`, or use [this table](https://www.kernel.org/doc/html/v4.11/admin-guide/sysrq.html#how-do-i-enable-the-magic-sysrq-key) to determine the code for the functions you want to enable (multiple values can be added together).