Avid Pro Tools is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Audacity, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Avid Pro Tools and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Avid Pro Tools are LMMS (Free, Open Source), Reaper (Paid), Ardour (Freemium, Open Source) and Bitwig Studio (Paid).
Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling.
"The free and open source audio editor" is an easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. It is a fork of Audacity that respects your privacy and the GNU License.