устанавливаем виртуальный QEMU из репозитария (хранилища программ, которое подключено по умолчанию) командами:
aptitude search qemu,
aptitude install qemu

root@***:~# aptitude search qemu
root@***:~# aptitude install qemu
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Couldn't find any package whose name or description matched "qemu"
Couldn't find any package whose name or description matched "qemu"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done