Error message "W: No sandbox user' _apt 'on the system, can not drop privileges"

[emailforfor]

How to get rid of the following error message when entering the command line
'sudo apt-get update':
'W: No sandbox user' _apt 'on the system, can not drop privileges'
Is the message a problem at all?

[dobey]

I presume this is inside libertine, as apt is not supported in the host system.

No, it's only a warning, so not a real issue.