I installed the armhf .deb package on Ubuntu MATE 20.04 Focal Fossa. I tried to run it from the icon in the Menu and it didn't work. So I tried to run from Terminal to see what the issue was.
I ran it from the terminal and got this:
[2473:2473:1216/193541.942701:ERROR:chrome_content_client.cc(343)] Failed to locate and load the component updated flash plugin. [2508:2516:1216/193548.036732:ERROR:nss_util.cc(283)] After loading Root Certs, loaded==false: NSS error code: -8018 ../../chromium/sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.cc:**CRASHING**:seccomp-bpf failure in syscall 0403 [2473:2473:1216/193548.596873:ERROR:vivaldi_ui_web_contents_delegate.cc(42)] UI Process abnormally terminates with status 3 after running for 1.87996 seconds! [2473:2473:1216/193548.684970:ERROR:vivaldi_ui_web_contents_delegate.cc(73)] Quiting Vivaldi ../../chromium/sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.cc:**CRASHING**:seccomp-bpf failure in syscall 0403
I've used this before on Raspberry Pi OS (previously called Raspbian) with no issues, but I switched over to Ubuntu MATE and now I'm having trouble.