There are many alternatives to Krusader for Linux if you are looking for a replacement. The best Linux alternative is Double Commander, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Krusader and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Krusader are Midnight Commander (Free, Open Source), Dolphin File Manager (Free, Open Source), Thunar (Free, Open Source) and fman (Freemium).
Dolphin is a file manager for KDE focusing on usability. Has three view modes: Icon, Detail and it used to have Column View like in Finder (it is not available in current version due to problems with maintaibility). Supports FTP, SCP and other protocols. Highly configurable.
Thunar is a new modern file manager for the Xfce Desktop Environment. Thunar has been designed from the ground up to be fast and easy-to-use. Its user interface is clean and intuitive, and does not include any confusing or useless options.
SpaceFM is a multi-panel tabbed file and desktop manager for Linux with built-in VFS, udev- or HAL-based device manager, customisable menu system, and bash integration. SpaceFM aims to provide a stable, capable file manager with significant customisation capabilities.
Worker is a file manager for the X Window System on UN*X with low requirements (basically only the X11 libraries). The directories and files are shown in two independent panels (similar to Midnight Commander).