downgrading qemu on Ubuntu 18.04

[nataraj88]

I believe I was previously running the following version of qemu before the most recent upgrade 2 weeks ago::
qemu 1:2.11+dfsg-1ubuntu7.36 (Accepted)2/22/21, 8:28 A

On 7/15/21 I installed the following update:
ubuntu/bionic-updates] qemu 1:2.11+dfsg-1ubuntu7.37 (Accepted) 7/15/21

This update appears to have broken something and I am having problems with all of my VM's hanging.
I would like to downgrade, but the older version of qemu does not appear to be available in the repository:, possibly because the .37
version was issued twice (as indicated in the bionic-changes list)

t# aptitude versions qemu
Package qemu:                              
p   1:2.11+dfsg-1ubuntu7                          bionic                    500 
p   1:2.11+dfsg-1ubuntu7.37                       bionic-security           500 

Package qemu:i386:
p   1:2.11+dfsg-1ubuntu7                          bionic                    500 
p   1:2.11+dfsg-1ubuntu7.37                       bionic-security           500

How can I downgrade qemu to the 7.36 version?

Thank You,
Natu

[MAFoElffen]

Please go back and edit your first post and wrap your output with these tags: [ c o d e ] Output_Text [ / c o d e ] ...
...Without the extra spaces I added there to display that to you as an example.

First, take a backup of where it is at now... Before you start making changes, so you have a fallback point.

Then... Please consider making the Canonical/Ubuntu system work for all of us, by reporting that update as a Bug to Launchpad. As a user of Qemu/KVM, that helps all of us.

If for some reason, you can't, or you have a requirement that prevents you from that... Then, well, I understand.

The missing info I see... Well, let me startup my other computer and spin up an 18.04 nested Qemu/KVM Server VM so I can look at it... BRB in another post. Right now, on this machine, I'm on Arm64 and a different release.

So I can look without chasing ghosts, you didn't mention kvm or libvirt, and you are on 18.04... Is your host 64bit or 32bit?

[nataraj88]

libvirt was not updated during the time frame when the problem began for me (based on checking the bionic-changes list). I should have mentioned kvm which includes at least linux-kvm and linux-meta-kvm. Is there an easy way to downgrade an umbrella package like linux-meta-kvm?

[nataraj88]

Oh yes, my host and VMs are all 64 bit.

[MAFoElffen]

But you installed the package qemu-kvm right?

If I go to an instance of Ubuntu server 18.04 LTS and look at

apt policy qemu

I do not see the package qemu as being installed in a normal install of qemu-kvm...

Now if I look at

apt poilcy qemu-kvm

Now... That shows up as being that version currently... Could you please do that and check?

[MAFoElffen]

curious about what the update broke im your VM Guests?]

[MAFoElffen]

curious about what the update broke im your VM Guests?]

[Dennis N]

qemu is just a metapackage so it's non-functional except to perhaps install something else. The description even says you can remove it. Your problem lies somewhere else.

Why not delete qemu, and upgrade 18.04 to 20.04 and get newer packages? It may fix your problem as well.

[nataraj88]

You are correct in that neither qemu nor kvm are installed separately.

 $ apt policy qemu kvm qemu-kvm linux-kvm
qemu:
  Installed: (none)
  Candidate: 1:2.11+dfsg-1ubuntu7.37
  Version table:
     1:2.11+dfsg-1ubuntu7.37 500
        500 http://mirrors.namecheap.com/ubuntu bionic-security/universe amd64 Packages
     1:2.11+dfsg-1ubuntu7 500
        500 http://mirrors.namecheap.com/ubuntu bionic/universe amd64 Packages
kvm:
  Installed: (none)
  Candidate: (none)
  Version table:
qemu-kvm:
  Installed: 1:2.11+dfsg-1ubuntu7.37
  Candidate: 1:2.11+dfsg-1ubuntu7.37
  Version table:
 *** 1:2.11+dfsg-1ubuntu7.37 500
        500 http://mirrors.namecheap.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-kvm:
  Installed: (none)
  Candidate: 4.15.0.1097.93
  Version table:
     4.15.0.1097.93 500
        500 http://mirrors.namecheap.com/ubuntu bionic-security/main amd64 Packages

I got these package names from the bionic-changes list. So the package linux-kvm is actually installed and was last updated on 7/5 and again on 7/20, so that would make this package my first suspect.

[MAFoElffen]

I do not see a path backwards, only current and forward... 7.36 does not exist in any of the repo's anymore...

Now... What rpoblems are you having with your guest?