VM suddenly became unaccessible. "File not found" yet it's right there

[matteo sisti sette]

I have a VM I've used for ages. Now it's been a while since the last time. I've meanwhile upgraded the host from Ubuntu 12.10 to 13.04 (just upgraded, not reinstalled).

The VM and its virtual disks are where they've always been: on a NTFS partition. Nothing has moved or changed.

Now when I run VB, my VM is listed as "inaccessible". On the right panel, it says:

Runtime error opening '/media/NTFS_50GB/VirtualBox VMs/Windows 7 64bit ITA/Windows 7 64bit ITA.vbox' for reading: -102 (File not found.).
/home/vbox/vbox-4.1.18/src/VBox/Main/src-server/MachineImpl.cpp[708] (nsresult Machine::registeredInit()).
Result Code: 
NS_ERROR_FAILURE (0x80004005)
Component: 
VirtualBox
Interface: 
IVirtualBox {c28be65f-1a8f-43b4-81f1-eb60cb516e66}

THE FILE IS RIGHT THERE and it IS accessible.

Host: Ubuntu 13.04 (formerly 12.10 last time it worked) Guest: Window 7 (should be totally irrelevant)

Please besides fixing this I urgently need a workaround to get my VM working.

[matteo sisti sette]

Ok, it's because the Ubuntu upgrade has changed the path where the partition gets mounted. Without warning.

Going to report the bug to Ubuntu, not a VB issue.