Thanks - this got me past the original issue. What I did is I opened up Flatseal and granted access to all system files for Virtual Machine Manager.

However, now I’m stuck at a different point. I can get past where I choose how much memory, CPU, and disk storage to allocate, but when I get to Step 5 and click Finish,

This happens:

Unable to complete install: 'internal error: process exited while connecting to monitor: 2025-06-22T17:16:36.091623Z qemu-system-x86_64: -blockdev {"driver":"file","filename":"/run/media/myusername/path/to/installers/debian-12.11.0-amd64-netinst.iso","node-name":"libvirt-1-storage","read-only":true}: Could not open '/run/media/myusername/path/to/installers/debian-12.11.0-amd64-netinst.iso': Permission denied'

Traceback (most recent call last):
  File "/app/share/virt-manager/virtManager/asyncjob.py", line 71, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/app/share/virt-manager/virtManager/createvm.py", line 2008, in _do_async_install
    installer.start_install(guest, meter=meter)
  File "/app/share/virt-manager/virtinst/install/installer.py", line 726, in start_install
    domain = self._create_guest(
             ^^^^^^^^^^^^^^^^^^^
  File "/app/share/virt-manager/virtinst/install/installer.py", line 667, in _create_guest
    domain = self.conn.createXML(initial_xml or final_xml, 0)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/lib/python3.12/site-packages/libvirt.py", line 4590, in createXML
    raise libvirtError('virDomainCreateXML() failed')
libvirt.libvirtError: internal error: process exited while connecting to monitor: 2025-06-22T17:16:36.091623Z qemu-system-x86_64: -blockdev {"driver":"file","filename":"/run/media/myusername/path/to/installers/debian-12.11.0-amd64-netinst.iso","node-name":"libvirt-1-storage","read-only":true}: Could not open '/run/media/myusername/path/to/installers/debian-12.11.0-amd64-netinst.iso': Permission denied

This message is talking about permission denied, so I checked the file permissions, and I saw that the ISO file is owned by the qemu user:

myusername@fedora:~$ ls -la /run/media/myusername/path/to/installers
total 101472336
drwxr-xr-x. 2 myusername myusername       4096 Jun 16 14:47  .
drwxr-xr-x. 6 myusername myusername      12288 Jul 29  2024  ..
-rw-r--r--. 1 myusername myusername 7547453440 Oct 17  2024  bazzite-gnome-stable.iso
-rw-r--r--. 1 qemu       qemu        702545920 Jun 12 17:00  debian-12.11.0-amd64-netinst.iso

I changed it to myusername:

sudo chown myusername:myusername /run/media/myusername/path/to/installers/debian-12.11.0-amd64-netinst.iso

When I tried the same steps again, I got stuck in the same place and rerunning ls showed that the ISO file’s ownership has reverted back to qemu.

Any ideas?

Here are the results of some commands that I believe answer your questions. When I run the ls command against that directory, it says no such file or directory. Could this have something to do w/ the fact that Virtual Machine Manager is running as a flatpak? (as the other commenter @ormith@lemmy.world has hinted)

Here’s what I tried:

what are the permissions of /run/usr/1000/doc/c0a3c3fc

myusername@fedora:~$ ls -la /run/usr/1000/doc
ls: cannot access '/run/usr/1000/doc': No such file or directory

what user are you running VMM as

myusername@fedora:~$ ps aux | grep virt-manager
myusername      17995  0.0  0.0   3688  2048 ?        S    13:05   0:00 /usr/bin/bwrap --args 40 -- virt-manager
myusername      18011  0.0  0.0   3788  1396 ?        S    13:05   0:00 /usr/bin/bwrap --args 40 -- virt-manager
myusername      18013  1.5  0.3 889968 101424 ?       Sl   13:05   0:00 python3 /app/bin/virt-manager
myusername      18147  0.0  0.0 230340  2224 pts/0    S+   13:06   0:00 grep --color=auto virt-manager

EDIT: I got past this issue by opening up Flatseal and granting access to all system files for Virtual Machine Manager; however, now I’m getting stuck on another permission issue after I choose how much RAM, CPU, and disk space to allocate. Reference my response to @ormith@lemmy.world’s comment.

I copied the ISO file to my home directory but got the same result. Any other ideas?

EDIT: I got past this issue by opening up Flatseal and granting access to all system files for Virtual Machine Manager; however, now I’m getting stuck on another permission issue after I choose how much RAM, CPU, and disk space to allocate. Reference my response to @ormith@lemmy.world’s comment.