I've been trying to share a folder on a Windows 10 host with an Ubuntu server VirtualBox guest. Without any success. This answer to this question looked promising but failed at
$ sudo mount /dev/sr0 /cdrom
mount: /cdrom: mount point does not exist.
Host: Windows 10 Pro, 22H2 Build 19045.3930 Guest: Ubuntu Server 22.04.3 updated & upgraded to date
Surely there's some additional magic required. but what?
Here are some selected lines from VBox.log in a freshly built guest VM. The lines were taken after noting that Devices had already chosen the guest additions iso.
VBox.log excerpt:
00:00:49.320576 VMMDev: Guest Additions information report: Version 6.0.0 r127566 '6.0.0'
00:00:49.320633 VMMDev: Guest Additions information report: Interface = 0x00010004 osType = 0x00053100 (Linux >= 2.6, 64-bit)
00:00:49.320829 VMMDev: Guest Additions capability report: (0x0 -> 0x0) seamless: no, hostWindowMapping: no, graphics: no
00:00:49.321030 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:00:49.321150 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:00:51.431218 GUI: UISession::sltAdditionsChange: GA state really changed, notifying listeners
00:00:51.431266 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:17:20.664248 GUI: UISession::sltAdditionsChange: GA state really changed, notifying listeners
00:17:20.664350 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:17:40.092446 VMMDev: Guest Additions information report: Version 6.0.0 r127566 '6.0.0'
00:17:40.092896 VMMDev: Guest Additions information report: Interface = 0x00010004 osType = 0x00053100 (Linux >= 2.6, 64-bit)
00:17:40.093165 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:17:40.093562 VMMDev: Guest Additions capability report: (0x0 -> 0x0) seamless: no, hostWindowMapping: no, graphics: no
00:17:40.093747 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:17:40.127555 GUI: UISession::sltAdditionsChange: GA state really changed, notifying listeners
00:17:40.127607 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:25:19.300129 File system of 'C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso' (DVD) is ntfs
00:25:19.301531 Path <string> = "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" (cb=58)
sudo chown -R george:vboxsf /media/sf_diet
doesn't do the trick. Regardless, I'd happily accept your comment as the answer. – geoB Jan 13 '24 at 23:22