Thanks kovidgoyal.
According to Sinac in a previous thread:
Hiya, finally. It's a VirtualBox bug will be solved in the next release, at least
that's what the bug report says: (Vbox guest additions: missing shared library
dependency -> fixed after (not in) 6.0.4 and in test builds)
It was on that understanding that I upgraded Virtualbox 6.0.4 (and the guest extensions) to 6.0.6 yesterday and re-attempted the calibre installation, believing that the bug would be fixed by 6.0.6. I fear the bug has NOT been fixed in 6.0.6.
I'll try again when another version of VB has been released.
Thanks all for your help.
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