Installing IQmol is relatively easy (I did it with ubuntu 20.04 without problems). However with Ubuntu 22.04 there is a problem with the qt5-default package that seems to have been updated for this new LTS version of Ubuntu.

In the manual it says the following, after downloading iqmol_2.14.deb from their website:
"#> sudo dpkg -i iqmol_x.x.x.x.deb #> sudo apt-get install -f
The second command is required to resolve the dependency on the Qt libraries, which
you may not have installed."

From the first command the error is as follows:
"dpkg: dependency issues prevent iqmol configuration:
iqmol depends on qt5-default; however:
The qt5-default package is not installed.
dpkg: error processing iqmol package (--install):
dependency problems - leaving unconfigured.
Processing triggers for man-db (2.10.2-1) ...
Errors encountered while processing
iqmol"

And from the second:
"The following packages will be REMOVED:
iqmol
0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/N]"

I have searched, unsuccessfully, for a way to install qt5-default manually on Ubuntu 22.04, but I still don't see how.
Please, someone who can point out the step-by-step.
Thank you very much in advance.

Edited:

I found that IQmol can be successfully installed using Wine and the Windows installer. FYI.