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I download the deb package from the official cisco's page, before run sudo dpkg -i PacketTracer_730_amd64.deb I get this error:

Selecting previously unselected package packettracer.
(Reading database ... 500916 files and directories currently installed.)
Preparing to unpack PacketTracer_730_amd64.deb ...
Unpacking packettracer (7.3.0) ...
dpkg: dependency problems prevent configuration of packettracer:
 packettracer depends on libdouble-conversion1; however:
  Package libdouble-conversion1 is not installed.
 packettracer depends on qt-at-spi; however:
  Package qt-at-spi is not installed.

dpkg: error processing package packettracer (--install):
 dependency problems - leaving unconfigured
Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu2) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu2) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for gnome-icon-theme (3.12.0-3) ...
Processing triggers for shared-mime-info (1.15-1) ...
Errors were encountered while processing:
 packettracer

when I search for those package libdouble-conversion1 and qt-at-spi seems like they aren't compatible with Ubuntu 20.04 and aren't in the default ubuntu repositories.

How can I install this dependencies?

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  • You have multiple problems: 1) dpkg does not resolve dependencies, which is why you got the "Uh-oh, dependency X isn't installed" output. 2) The dependencies are OLD: Both libdouble-conversion1 and qt-at-spi were dropped after 19.04. 3) There are several ways to accomplish what you ask, but none are easy, and all have a learning curve. – user535733 May 15 '20 at 22:00
  • So, the question is, what knowledge I need? What are those ways you mentioned? – Jean Persia May 15 '20 at 22:33
  • You can try pulling the packages you need from older releases of Ubuntu, and try to install them. That might work with a bit of tweaking. Or you can look for an alternative application that is in the 20.04 Ubuntu repositories. Alternately, you can search the internet for an AppImage or Flatpack or another packaged version of PacketTracer. If none of those options work out, then it's time to start building from source. – user535733 May 15 '20 at 23:55