I get an error when trying to save browser pages to any partition other than Home when using Chromium. The error does not occur in Firefox or Nautilus.
In an attempt to get write access to the Win 10 partition on my dual-boot system I may have changed some permissions before discovering that an upgrade in Windows had turned the troublesome fast boot back on. Turning it off and installing ntfs-config helped get access to partitions for Firefox and Nautilus, but Chromium still gives the error message.
A similar issue was raised at:
where the solution was to reinstall. Maybe someone can suggest a better solution! Thanks!
Edit: Eventually this problem went away, probably due to an improvement through regular software updates. Chromium now allows saving on the various partitions of my system.