Foundry's Mari [1] is pretty heavily used in bigger VFX houses for texturing and it is also available for Linux. Likewise, Allegorithmic's (now owned by Adobe)

Foundry's Mari [1] is pretty heavily used in bigger VFX houses for texturing and it is also available for Linux. Likewise, Allegorithmic's (now owned by Adobe) Substance is available for Linux [2]. 1. https://www.foundry.com/products/mari/requirements https://www.foundry.com/products/mari/requirements 2. https://www.substance3d.com/products/tech-specs https://www.substance3d.com/products/tech-specs