Canonical does not ship Show archive.org snapshot Ubuntu 24.04+ Vagrant images due to HashiCorps switch to the Business Source License (BSL) Show archive.org snapshot . There is currently no open source fork of Vagrant.
Alternatives
Use LXD
LXD Show archive.org snapshot is an alternative which you can use to create containers and virtual machines. All Ubuntu versions are available as official LXD Image Show archive.org snapshot .
Use vagrant-libvirt
It's possible to run the official 
  Ubuntu Cloud Images
  
    Show archive.org snapshot
  
 with Vagrant by using libvirt instead of VirtualBox. There are 
  third party boxes
  
    Show archive.org snapshot
  
 like 
  cloud-image/ubuntu-24.04
  
    Show archive.org snapshot
  
 which can be used.
Caveats
- The images are unmodified but unofficial.
 - Sharing via the 
/vagrantfolder is not possible. Use SSH/SFTP instead.