SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Mount a ramfs 2. Copy a file from a regular volume to the ramfs 3. Dolphin will report the error from the title. 4. Repeat steps 1-3 only using the command line, it copies fine. 5. Repear steps 1-2 using another file manager, it also copies fine. The bug is dolphin. I would imagine it has something to do with the properties of the ramfs drive not having a fixed space. OBSERVED RESULT Dolphin will not copy the file EXPECTED RESULT Dolphin will copy the file as expected. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Many versions current to 2018 (available in About System) KDE Plasma Version: Many versions current to 2018 KDE Frameworks Version: Many versions current to 2018 Qt Version: Many versions current to 2018 ADDITIONAL INFORMATION None.