Getting Cisco Packet Tracer 7.1 to Run on Ubuntu 16.04 LTS


The desktop version of Cisco Packet Tracer (CPT) is currently available in three flavours: 32-bit and 64-bit versions for Windows 7, 8.1 and 10 and a 64-bit version for Linux. There is no macOS version so I decided to install the 64-bit Linux version of CPT ( on Ubuntu 16.04.3 LTS running on VMware Fusion (10.1.1).

UPDATE 2018-09-01: CPT 7.2 was released on 21st July 2018 which doesn’t appear to need as detailed in this article and runs without issue on Ubuntu 16.04 LTS. However, there’s now an issue with CPT 7.2 running on Ubuntu 18.04 as it can’t locate The answer from Lucas Almeida on StackExchange regarding installing fixed it for me.

I should mention that I have limited experience with Ubuntu and Linux in general. I merely enjoy dabbling when I need to and am unsure of the dangers or repercussions – if any – of the procedure detailed below which involves having two versions of the same library installed on one system. In my case, having Ubuntu on a VM solely for the purpose of running CPT presents little risk. Your situation may differ.

I followed the Installation section of these instructions to install CPT.

As part of the CPT installation I opted to have a symbolic link named packettracer – pointing to the file /opt/pt/packettracer – created in /usr/local/bin. /opt/pt is CPT’s default installation directory. However, when running packettracer very little appears to happen apart from being told that CPT is starting:

Dummy Content
Starting Packet Tracer 7.1



Looking at /opt/pt/packettracer we can see that it executes PacketTracer7 located in /opt/pt/bin:


echo Starting Packet Tracer 7.1

pushd $PTDIR/bin > /dev/null
./PacketTracer7 "$@" > /dev/null 2>&1
popd > /dev/null



Executing /opt/pt/bin/./PacketTracer7 should give some clues:

Dummy Content
/opt/pt/bin/./PacketTracer7: error while loading shared libraries: cannot open shared object file: No such file or directory



There’s an error loading, but this message is a little misleading. You’ll notice in /opt/pt/packettracer on line 6 that the LD_LIBRARY_PATH environment variable is temporarily set to /opt/pt/lib and tells CPT where to look for shared libraries. Let’s change the command to include setting the value of the LD_LIBRARY_PATH variable:

Dummy Content
LD_LIBRARY_PATH=/opt/pt/lib /opt/pt/bin/./PacketTracer7
/opt/pt/bin/./PacketTracer7: error while loading shared libraries: cannot open shared object file: No such file or directory



There’s still an error loading a shared library, but this time it’s A quick search for libicui18n gives the following:

Dummy Content
sudo updatedb; locate libicui18n



It appears the correct library is installed, but CPT requires an older version – 52 instead of 55. A Debian package containing the older version of libicui18n is available at

To download the package type:

Dummy Content



To install this package type:

Dummy Content
sudo dpkg -i libicu52_52.1-3ubuntu0.8_amd64.deb



sudo updatedb; locate libicui18n now lists the following:

Dummy Content
sudo updatedb; locate libicui18n



CPT should now start:

Dummy Content
Starting Packet Tracer 7.1





Cisco Packet Tracer 7.1 running for the first time

Cisco Packet Tracer 7.1 running for the first time



In summary, the Linux version of CPT ( requires an older version of the libicui18n library not available in Ubuntu 16.04.3 LTS. CPT ( will run on Ubuntu 16.04.3 LTS providing the older library is installed alongside the newer one. As a side note, I found that CPT ( does run without issue on Ubuntu 14.04.5 LTS where the required older version of the library is installed as default.

1 CPT was updated to version 7.1.1 on 8th December 2017, but will still not run unless the older is installed.

About the author

A native Brit exiled in Japan, Steve spends too much of his time struggling with the Japanese language, dreaming of fish & chips and writing the occasional blog post he hopes others will find helpful.

53 responses


  • I just want to let you know that there is a new, more straightforward
    way to install Packet Tracer on any Linux that supports Flatpak
    (including Ubuntu) – check out at

    I also have a hard time to get it working and keep it working over
    dist-upgrades. This method may be the final answer to this issue. Please
    share your opinion if you try it.

  • Thanks a bunch for this post, helped a lot. Now, you might want to update the file to be downloaded, since is not there anymore, but is, instead. Minor version change.

  • Hello,

    my CPT starts but only via CLI. I tried to make Dash icon and I can actually see it there but its not starting when I click on it and its not normal icon, its just invisible picture. Can you help me to solve this?

    • @Robo,

      The instructions I used to install CPT – and linked to at the beginning of this article – also contain details on how to create a Dash icon. I’ve just followed these and created an icon on the Desktop which successfully launches CPT. In my case, I replaced cp /opt/pt/bin/Cisco-PacketTracer.desktop ~/.local/share/applications/Cisco-PacketTracer.desktop shown in the instructions with cp /opt/pt/bin/Cisco-PacketTracer.desktop ~/Desktop/Cisco-PacketTracer.desktop to place the launcher on the Desktop.

      Regards, Steve.

  • I found this on other forum and it resolved my issue
    Navigate to the directory where PacketTracer is installed (this is the default):

    cd /opt/pt/bin

    then run PacketTracer7


    Now, if it shows a list of “libqt5xxx” missing libraries, please install them all.

    sudo apt install libqt5xxx*

    Remember, just write everything that is behind the first . and to put the * in the end of the name of the package.

    In my case, it was a package named “”, so I did this:

    sudo apt-get install libQt5Script*

    After that, running PacketTracer7


  • Thanks Steve,

    This is a great post, useful and to the point. Thanks to you Packet Tracer 7.1.1 is now happily running on Xubuntu 16.04 64 bits in about 10 minutes.


  • Cheers Steve!

    I am running Ubuntu 16.04 LTS and the only thing I had to do was to install the old library and it started working. So just doing the following fixed the error:
    1) wget
    2) sudo dpkg -i libicu52_52.1-3ubuntu0.7_amd64.deb

    Regards, Chris

  • Hi Steve,

    I’m running on Kali Linux and have the exact same issue except the file I need is and nothing seems to work for getting it. I’ll have to have another go at this when I’m less tired and see if I can sort it.

    Kind regards,

  • Hi, Steve.
    I’m trying to install PacketTracer 7 and I followed all instructions you (and other ‘gurus’) provided but…It didn’t work.

    My system is as follows:

    VERSION=”16.04.3 LTS (Xenial Xerus)”
    PRETTY_NAME=”Ubuntu 16.04.3 LTS”

    Also, I have noticed that: => not found => not found

    I really tried to install those libraries above, but I failed. Miserably. Can you help me?
    My best regards

    • @Cesar,

      Sorry you’re having trouble getting CPT to run. Both and are installed as part of the CPT installation in /opt/pt/lib/. If they’re not there, then I suspect CPT is not installed on your system. Remember, this article doesn’t cover how to install CPT, but does include a link to the installation instructions I used.

      If those files are present, then ensure you’re not trying to start CPT with PacketTracer7 in Terminal. You need to use either /opt/pt/packettracer or the symbolic link packettracer. See my reply to Momcilo’s comment further down the page.

      Regards, Steve.

  • Thank you. After some tweaks here and there. Cisco Packet Tracer version 7.1.1 works in Loki. You are an extraordinary living legend. All the best for you!!!

  • Hi,

    I trying to install packettracer on my Manjora. When I execute /opt/pt/bin/PacketTracer7, it shows:

    /opt/pt/bin/PacketTracer7: error while loading shared libraries: cannot open shared object file: No such file or directory

    I tried to execute sudo updatedb, but no clue. Please help.

    sudo: updatedb: command not found

    • @Yuna,

      I’m not familiar with Manjaro nor Arch Linux in general. updatedb manages a database used by locate. The equivalent of locate in Manjaro appears to be mlocate. As for installing the package containing libicui18n mentioned in the article, this is a Debian package for Debian-based Linux distros such as Ubuntu. Not sure if it should – or can – be installed on Arch-based Linux distros. See here.

      Regards, Steve.

  • I do this all:

    sudo updatedb; locate libicui18n

    but after it didn’t start, i start the /opt/pt/bin$ ./PacketTracer7 file and become an error:
    “error while loading shared libraries: cannot open shared object file: No such file or directory”

    Can someone help me ?

    • @Momcilo,

      You need to run /opt/pt/packettracer which first sets the LD_LIBRARY_PATH variable to tell CPT where to find the shared libraries it requires and then executes PacketTracer7. If you run PacketTracer7 directly the LD_LIBRARY_PATH variable is not set and will result in the errors you’re seeing.

      NOTE: If you had the CPT installation create a symbolic link named packettracer in /usr/local/bin you can run packettracer instead of /opt/pt/packettracer.

      Regards, Steve

  • Thanks Steve for this post. Thumbs-up, it helped me bigtimes. This problem had stuck with me for a week now until I landed on your blog. huuuuuuuw!!!…Now I can breathe

  • Hi Guys,
    I had an error the following day after installation. I was desperate and finally found your explanations. My problem was the system required me to join NETACAD. I entered
    and redirected me to their web page when I log in and it currently up and running.
    Thanks a lot,

    • @fmartap,

      I think enrolling with the Cisco Network Academy (NetAcad) is a pre-requisite for downloading Packet Tracer from their site. It certainly is for running it.

      Regards, Steve.

      • There are plenty of alternatives to download to avoid logins. I use this, where the guy updates on time.

        • @Rezah,

          I wasn’t aware that CPT could be downloaded from elsewhere. Thanks for that.

          Two things I noticed: 1. The version I downloaded form still won’t run until the older version of libicui18n has been installed. 2. It still presents a login prompt for NetAcad. So, IMHO there doesn’t seem any advantage to using this download location.

          Regards, Steve.

  • Great post there!

    Extremely helpful and clear. Thank you very much for taking the time for this great contribution.

    PD: From this post, I could not tell the fact you mentioned of you having limited experience with Ubuntu or Linux in general.



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