ubiquity tells me my computer name already exists on the network - hostname lookup can be slow

Screenshot showing one of the host-names I tried that generated the "name already exists on network" error

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/924511

THe warning persists for every name I try, until I just give up and move to the username field and start typing there. As soon as I enter something in the username field, the hostname warning changes to a green checkmark.

Possibly, this is a duplicate of bug 828181?
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I was unable to recreate this using ubiquity 2.9.15 on an Ubuntu amd64 Live CD.

Discussed in #ubuntu-installer:

09:55 < stgraber> that test takes a while so it's done using the _async
                  function in ubiquity which means it can take up to 4-5s
                  before the warning shows up or disappears

So the warning probably would have disappeared if you had been more patient. ;-)
Additionally, a check may also be done when switching fields hence it sorting itself out.

Hmm, even on Edubuntu using the same example as above I couldn't reproduce the issue, the dialog seems to behave as expected here.

Jeff: Could you try with a recent image (beta1) and confirm it still happens for you?

A change in ubi-usersetup that went in a bit before beta1 fixes a bunch of cases where the local DNS server gives IP addresses for pretty much any hostname, maybe that same fix fixed your problem?

Bug 1030475 is from a user who seems to have been installing Quantal.

Marking this back to confirmed as it is seen on Quantal as well.

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

I've seen this multiple times over the years, due to how I set up VMs with development release. Last verified earlier right now with the latest Ubuntu Focal live image.

1. On the "Who are you?"-screen, type in your name, for instance "ubuntu".
2. It will autosuggest your computer's name as "ubuntu-Virtualbox" (or machine name on physical machine)
3. The Virtualbox part is uneeded, remove that.
4. Ops, cannot end in a dash. Remove that as well.
5. Tab to the next field.

Expected:
Everything ok, I pick a username and fill in my password.

Actual:
When I tab to the username field, I get the error message stating "that name already exists on the network". It stays there until I start filling in my password, or (according to comments above) enough time has passed.

Still present in current Ubuntu Jammy daily image