Memory failing! I had VB working fine on 16.04 but I'll be blowed if I can remember how I did it!
I have searched for similar questions but the answers all appear to be for different OS's
Host - Ubuntu 18.04 Desktop.
VirtualBox 5.2.10 (installed using Ubuntu Software centre).
Guest - Ubuntu 18.04 Desktop.
I've added my username to the vboxusers group.
I 'insert' the Guest Additions CD and at the pop-up I click on Run
Terminal window opens and all I get is -
Verifying archive integrity... All good.
Uncompressing VirtualBox 5.2.10 Guest Additions for Linux........
VirtualBox Guest Additions installer
Removing installed version 5.2.10 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
VirtualBox Guest Additions: Building the VirtualBox Guest Additions
kernel modules.
VirtualBox Guest Additions: Running kernel modules will not be replaced
until the system is restarted
VirtualBox Guest Additions: Starting.
Press Return to close this window...
Not worried about clipboard etc. - all I want is to use USB memory stick.
Dummy help please 'cause I've no idea what to do next!
Tim