Comment 48 for bug 2039873

This was verified on Jammy with -proposed (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1). Here's how:

$ lxc launch ubuntu-daily:22.04 c1
Creating c1
Starting c1

root@c1:~# apt-get update
...
root@c1:~# apt-get install -Vy liblxc-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
   libfuse2 (2.9.9-5ubuntu3)
   liblxc-common (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1)
   liblxc1 (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1)
   lxcfs (5.0.0-0ubuntu2)
   uidmap (1:4.8.1-2ubuntu2.1)
The following NEW packages will be installed:
   libfuse2 (2.9.9-5ubuntu3)
   liblxc-common (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1)
   liblxc-dev (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1)
   liblxc1 (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1)
   lxcfs (5.0.0-0ubuntu2)
   uidmap (1:4.8.1-2ubuntu2.1)
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 1462 kB of archives.
...

root@c1:~# dpkg -l | grep liblxc-dev
ii liblxc-dev 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1 amd64 Linux Containers userspace tools (development)
root@c1:~# grep LXC_DEVEL /usr/include/lxc/version.h
#define LXC_DEVEL 1

# enable -proposed

root@c1:~# apt-get update
...
root@c1:~# apt-get install -Vy liblxc-dev
...
The following packages will be upgraded:
   liblxc-common (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1 => 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1)
   liblxc-dev (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1 => 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1)
   liblxc1 (1:5.0.0~git2209-g5a7b9ce67-0ubuntu1 => 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1)
3 upgraded, 0 newly installed, 0 to remove and 32 not upgraded.
Need to get 1268 kB of archives.
...

root@c1:~# grep LXC_DEVEL /usr/include/lxc/version.h
#define LXC_DEVEL 0