DeepSkyStacker is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is Siril, which is both free and Open Source. If that doesn't suit you, our users have ranked eight alternatives to DeepSkyStacker and four of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to DeepSkyStacker are PixInsight (Paid), Regim (Free) and Qastrocam (Free, Open Source).
Regim makes some processing steps that are unique to astronomical images a bit easier. These steps are calibration (dark and flat), deblooming, registration, combination, color calibration, gradient removal and some more.
Qastrocam is a capture program to do astrophotography. It can control a telescope to do guiding with the images received from a V4L device. It can also control the extended features of a webcam modified to do long exposure (several seconds) captures.