PulseView is an opensource GUI for sigrok. It displays recorded waveforms from logic analyzers and oscilloscopes and it can perform various signal measurements and digital protocol decoding. Being opensource and Qt based, it is also cross platform. You can find it in the Ubuntu repositories, but the version is rather old and you'll be missing some new features and protocol decoders.
You will find in this post a script based on building instructions from official
sigrok/PulseView wiki that automatically downloads, builds and installs all required dependencies and PulseView itself. The script has been written and tested on
Ubuntu 17.10 but it should work on other
apt based distros.
