Indeed, right now it seems to only support fuse2

libfuse-dev
Run-time dependency fuse found: YES 2.9.9

libfuse3-dev
Run-time dependency fuse found: NO (tried pkgconfig and cmake)

This is only needed for libvirt-lxc which is universe only and strongly 
discouraged in favor of LXD (much better for the same use case).
Introduced in [1] and not much changed since then it is pre-3.0 as that didn't 
exist back in 2012 afaik.

I'll file an issue upstream to support fuse3 as I'm convinced it is generally 
the right thing.
But if this is the last issue holding us back we can as well disable fuse 
support in ubuntu's libvirt without much consequence for users (libvirt-lxc 
still works, just some /proc info isn't as isolated)

Note [2] holds transition instructions.
And [3] shows that plenty of upstream projects got bugs filed back then when 
3.0 released.
Many of them changed, libvirt didn't get a bug back then and might therefore 
not be aware yet.

Prio wishlist, since as I said worst-case we can disable it.

[1]: 
https://libvirt.org/git/?p=libvirt.git;a=commit;h=2a596dac5e00c4fcf750a693fd6174b68188efc3
[2]: 
https://github.com/libfuse/libfuse/blob/master/ChangeLog.rst#libfuse-300-2016-12-08
[3]: 
https://letmegooglethat.com/?q=%22This+is+a+maintenance+release+from+the+2.9+branch+of+libfuse.+Users+are+encouraged+to+transition+to+the+actively+developed+libfuse+3.x.%22

** Changed in: libvirt (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: libvirt (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1935664

Title:
  Please switch to fuse3

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