我正在尝试使用维基百科。但是由于 qemu-system-x86 的依赖关系未得到满足，我得到了错误。有解决方法吗？或者我应该提交错误报告。
$ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils
Reading package lists... Done
Building dependency tree
Reading state information... Done
bridge-utils is already the newest version (1.5-16ubuntu1).
bridge-utils set to manually installed.
libvirt-clients is already the newest version (4.6.0-2ubuntu3).
libvirt-daemon-system is already the newest version (4.6.0-2ubuntu3).
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
qemu-kvm : Depends: qemu-system-x86 (= 1:2.12+dfsg-3ubuntu8.1)
E: Unable to correct problems, you have held broken packages.
编辑：这是以下评论所要求的 sources.list
$ grep -v '^#' /etc/apt/sources.list
deb http://us.archive.ubuntu.com/ubuntu/ cosmic restricted main
deb http://us.archive.ubuntu.com/ubuntu/ cosmic-updates restricted main
deb http://us.archive.ubuntu.com/ubuntu/ cosmic universe
deb http://us.archive.ubuntu.com/ubuntu/ cosmic-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ cosmic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ cosmic-updates multiverse
deb http://us.archive.ubuntu.com/ubuntu/ cosmic-backports restricted universe multiverse main
deb http://security.ubuntu.com/ubuntu cosmic-security restricted main
deb http://security.ubuntu.com/ubuntu cosmic-security universe
deb http://security.ubuntu.com/ubuntu cosmic-security multiverse
deb [arch=amd64] https://download.docker.com/linux/ubuntu cosmic stable