20.10: Installing a .deb with dependencies -- HowTo?

[Colin Law]

On Mon, 26 Apr 2021 at 14:41, Robert Heller <heller at deepsoft.com> wrote:
>
> At Mon, 26 Apr 2021 12:18:23 +0100 "Ubuntu user technical support,? not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
>
> >
> > installed the dependencies.  Is the deb file available for download
> > somewhere?
>
> Yes, from the ODA website:
>
> https://www.opendesign.com/guestfiles/oda_drawings_explorer
>
> I did it on a freshly installed 20.10 VM (minimum desktop install).

Is this the error you got?

$ sudo dpkg -i Downloads/ODADrawingsExplorer_QT5_lnxX64_7.2dll_22.3.deb
dpkg: regarding .../ODADrawingsExplorer_QT5_lnxX64_7.2dll_22.3.deb
containing odadrawingsexplorer, pre-dependency problem:
 odadrawingsexplorer pre-depends on qt5-default (>= 5.3.0)
  qt5-default is not installed.
dpkg: error processing archive
Downloads/ODADrawingsExplorer_QT5_lnxX64_7.2dll_22.3.deb (--install):
 pre-dependency problem - not installing odadrawingsexplorer
Errors were encountered while processing:
 Downloads/ODADrawingsExplorer_QT5_lnxX64_7.2dll_22.3.deb

It isn't a 20.10 issue, it is the fact that the package has
qt5-default specified as a pre-dependency, which means that dpkg can't
even think about installing it unless that package is installed first.
Why they have done that I don't know.  I have never come across that
problem before.  I haven't got an 18.04 system but I would be very
surprised if it was any different on that.

Colin