我在 Ubuntu 18.04 LTS 机器上运行 GNOME Boxes 时遇到问题。我相信我已经安装了所有当前可用的更新（但不是 Disco Dingo），并尝试安装 qemu 等软件包，但无济于事。我正在尝试运行 Ubuntu Server 18.04 LTS。日志文件在这里：
Broker URL: qemu+unix:///session
Domain: ubuntu18.04
UUID: 56b4259c-36a8-4211-98e8-f99b08baaf1f
Persistent: yes
Cpu time: 0
Memory: 2097152 KiB
Max memory: 8038748 KiB
CPUs: 4
State: GVIR_DOMAIN_STATE_SHUTOFF
Domain config:
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<domain type="kvm">
<name>ubuntu18.04</name>
<uuid>56b4259c-36a8-4211-98e8-f99b08baaf1f</uuid>
<title>Ubuntu 18.04 LTS</title>
<metadata>
<boxes:gnome-boxes xmlns:boxes="https://wiki.gnome.org/Apps/Boxes">
<os-state>installed</os-state>
<os-id>http://ubuntu.com/ubuntu/18.04</os-id>
<media-id>http://ubuntu.com/ubuntu/18.04:0</media-id>
<media>/home/dbudke/Documents/Disk Images/Ubuntu Server 18.04.iso</media>
</boxes:gnome-boxes>
</metadata>
<memory unit="KiB">2097152</memory>
<currentMemory unit="KiB">2097152</currentMemory>
<vcpu placement="static">4</vcpu>
<os>
<type arch="x86_64" machine="pc-i440fx-bionic">hvm</type>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode="custom" match="exact" check="partial">
<model fallback="allow">IvyBridge-IBRS</model>
<topology sockets="1" cores="2" threads="2"/>
</cpu>
<clock offset="utc">
<timer name="rtc" tickpolicy="catchup"/>
<timer name="pit" tickpolicy="delay"/>
<timer name="hpet" present="no"/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled="no"/>
<suspend-to-disk enabled="no"/>
</pm>
<devices>
<emulator>/usr/bin/kvm-spice</emulator>
<disk type="file" device="disk">
<driver name="qemu" type="qcow2" cache="writeback"/>
<source file="/home/dbudke/.local/share/gnome-boxes/images/ubuntu18.04"/>
<target dev="vda" bus="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
</disk>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<target dev="hdc" bus="ide"/>
<readonly/>
<address type="drive" controller="0" bus="1" target="0" unit="0"/>
</disk>
<controller type="usb" index="0" model="ich9-ehci1">
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x7"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci1">
<master startport="0"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x0" multifunction="on"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci2">
<master startport="2"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x1"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci3">
<master startport="4"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x2"/>
</controller>
<controller type="pci" index="0" model="pci-root"/>
<controller type="ide" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x06" function="0x0"/>
</controller>
<controller type="ccid" index="0">
<address type="usb" bus="0" port="2"/>
</controller>
<interface type="user">
<mac address="52:54:00:89:2c:ca"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0"/>
</interface>
<smartcard mode="passthrough" type="spicevmc">
<address type="ccid" controller="0" slot="0"/>
</smartcard>
<serial type="pty">
<target type="isa-serial" port="0">
<model name="isa-serial"/>
</target>
</serial>
<console type="pty">
<target type="serial" port="0"/>
</console>
<channel type="spicevmc">
<target type="virtio" name="com.redhat.spice.0"/>
<address type="virtio-serial" controller="0" bus="0" port="1"/>
</channel>
<channel type="spiceport">
<source channel="org.spice-space.webdav.0"/>
<target type="virtio" name="org.spice-space.webdav.0"/>
<address type="virtio-serial" controller="0" bus="0" port="2"/>
</channel>
<input type="tablet" bus="usb">
<address type="usb" bus="0" port="3"/>
</input>
<input type="mouse" bus="usb">
<address type="usb" bus="0" port="4"/>
</input>
<input type="keyboard" bus="usb">
<address type="usb" bus="0" port="5"/>
</input>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<graphics type="spice">
<listen type="none"/>
<image compression="off"/>
</graphics>
<sound model="ac97">
<address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/>
</sound>
<video>
<model type="qxl" ram="65536" vram="65536" vgamem="16384" heads="1" primary="yes"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
</video>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="6"/>
</redirdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="1.1"/>
</redirdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="1.2"/>
</redirdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="1.3"/>
</redirdev>
<hub type="usb">
<address type="usb" bus="0" port="1"/>
</hub>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x00" slot="0x08" function="0x0"/>
</memballoon>
</devices>
</domain>
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任何帮助，将不胜感激。