Yes, the same thing has been happening to me since the Bionic upgrade:
Terminal warning is the same:
(gnome-boxes:2678): Boxes-WARNING **: 00:48:02.973: machine.vala:629: Failed to
start Win10 Home: Unable to start domain: unsupported configuration: CPU mode
'custom' for x86_64 kvm domain on x86_64 host is not supported by hypervisor
(gnome-boxes:2678): Boxes-WARNING **: 00:48:34.093: machine.vala:629:
Failed to start Fedora 27: Unable to start domain: unsupported
configuration: CPU mode 'custom' for x86_64 kvm domain on x86_64 host is
not supported by hypervisor
Virt-manager gives me this:
Error starting domain: unsupported configuration: CPU mode 'custom' for x86_64
kvm domain on x86_64 host is not supported by hypervisor
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb
callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 82, in newfn
ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1508, in startup
self._backend.create()
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1062, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: unsupported configuration: CPU mode 'custom' for x86_64 kvm
domain on x86_64 host is not supported by hypervisor
All working fine before upgrade.
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https://bugs.launchpad.net/bugs/1759806
Title:
Unable to start VM in gnome-boxes
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