On 21 Mar 2020 02:58:08 GMT,
Robert Riches , in
 wrote:
>  On 2020-03-21, bob prohaska  wrote:
> > I'm seeing rather frequent lockups on Buster using the
> > traditional graphics driver and chromium. Attempting the
> > "advanced" driver makes the problem much worse. All three
> > are up-to-date. The Pi still answers pings.
> >
> > Older versions of x11 had an escape sequence to kill the
> > server and get back to a command line without pulling the
> > plug. If that's still so, could somebody please tell me
> > what it is?
> >
> > Thanks for reading,
> >
> > bob prohaska
>
>  Are you referring to Alt-Ctrl-Backspace?

Yes. It is also disabled by default.

https://askubuntu.com/questions/10622/how-can-i-enable-ctrlaltbackspace

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