About Ubuntu Real and virtual machines copy each other

My development environment is on Ubuntu, but there is no official support on Ubuntu QQ, some is not very convenient, so in the above virtual a Win7 (first win10, but win10 the latest version too pit, do not say), but often appear to copy files, or the text content is not normal situation, after several occurrences finally groped out the law, finally determined the reason, is the account authority question, the account isolation does very well, the shearing board is the account inside shares, specifically says is:

When I open a virtual machine with a AAA account, copy executed with AAA can be copied successfully, but copy with Root does not work, and vice versa.

I guess the Linux user Rights policy is like this, all Linux should behave the same, but no other distributions have been tested.

About Ubuntu Real and virtual machines copy each other