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I installed KVM on ubuntu 16.04 and when I run virt manager it shows this message:

Warning: KVM is not available. This may mean the KVM package is not installed, or the KVM kernel modules are not loaded. Your virtual machines may perform poorly

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You either haven't installed qemu-kvm or you don't have virtualization enabled from BIOS.

Run this to make sure that you have KVM modules installed:

sudo apt-get install kvm qemu

And run this to make sure you have virtualization enabled from BIOS (If you don't then enable that):

grep vmx /proc/cpuinfo

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  • as you say i did it, and then i open virt-manager now it show me ERROR: No Active Connection to install on
    – harsh
    Sep 12 '16 at 7:43
  • @harsh, what hardware do you have brand/model? I have seen similar case when VT is enabled but virtualbox couldn't detect it. (an HP Elite Pro) We fixed that by upgrading EFI/BIOS firmware.
    – user.dz
    Nov 17 '16 at 12:02
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    Enabling virtual in the bios was correct. There were Advanced settings in CPU and North Bridge for virtualization. On Ubuntu 18.04, kvm is no longer a package. apt install qemu-kvm worked. On AMD Rizen 1700, the grep for vmx did not work. In /proc/cpuinfo, vmx is for Intel, smx is for AMD. The grep command should be: grep "vmx\|svm" /proc/cpuinfo.
    – rickfoosusa
    Jul 4 '18 at 23:47
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    I get Package kvm is not available, but is referred to by another package.
    – Navin
    Jun 5 '19 at 4:29
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For the users of Ubuntu 20.04 just run:

apt install qemu-kvm
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