Clipboard between OSX and Ubuntu (xterm, emacs...)

[GillesP]

I'm trying to exchange data between OSX and Ubuntu through the clipboard but unfortunately it is not working.
I've installed successfully the Parallels tools on Ubuntu and the only error I can see in the log is the following:
./installer/install-tools.sh: line 578: [: too many arguments
Has this error an impact on the clipboard management?

In the Parallels.log, I can also see something strange:
07-02 13:36:37.435 I CPTOOL /prlcp:1466:278bc700/ SelectionRequest
07-02 13:36:37.436 I CPTOOL /prlcp:1466:278bc700/ SelectionRequest
07-02 13:37:08.014 I CPTOOL /prlcp:1466:280bd700/ Receive : CPTOOL_CHECK_FOR_BUFFER_UPDATED m_IAmCliboardOwner=1
07-02 13:37:08.014 W CPTOOL /prlcp:1466:278bc700/ Tool isn't owner of clipboard!
07-02 13:38:04.198 I CPTOOL /prlcp:1466:280bd700/ Receive : CPTOOL_SET_DELAYED_PASTE (cpFormat=3)
07-02 13:38:04.200 I CPTOOL /prlcp:1466:278bc700/ SelectionRequest
07-02 13:46:13.153 I CPTOOL /prlcp:1466:280bd700/ Receive : CPTOOL_CHECK_FOR_BUFFER_UPDATED m_IAmCliboardOwner=1
07-02 13:46:13.153 W CPTOOL /prlcp:1466:278bc700/ Tool isn't owner of clipboard!
07-02 13:55:31.504 I CPTOOL /prlcp:1466:280bd700/ Receive : CPTOOL_SET_DELAYED_PASTE (cpFormat=3)
07-02 13:55:31.504 I CPTOOL /prlcp:1466:278bc700/ SelectionRequest

What does it mean?
How can I have clipboard working correctly?
FYI,
- In the configuration tab of the VM, "Copy & Paste" options are checked
- Inside ubuntu clipboard is working fine; I can select text from one xterm and paste it in other app with middle button...