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I have recently updated wireshark and I also checked the check box for the installation of Tshark

Is this in Synaptics Package Manager?

If so, presumably you clicked "Apply" in the toolbar of Synaptics, so that it would install the "tshark" package. If not, you must do so.

Start Synaptics and look for "tshark"; if it's installed, the checkbox for it should be green. If it's not green, check it, select "Mark for Installation" in the window that pops up, and click "Apply" in the toolbar.

even when I try to install it using "apt install tshark" I receive a message that the tshark package cannot be located.

If I do sudo apt install tshark on my Ubuntu 20.04 virtual machine, it prints

Reading package lists... Done
Building dependency tree       
Reading state information... Done
tshark is already the newest version (3.2.3-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

It also worked on my Ubuntu 21.04 virtual machine after I uninstalled it.

What version of Ubuntu are you running? (I'll be updating the 21.04 VM to 22.04 LTS, to allow testing of that.)

What command did you run to install tshark?

What wa the exact message it reported?

I have recently updated wireshark and I also checked the check box for the installation of Tshark

Is this in Synaptics Package Manager?

If so, presumably you clicked "Apply" in the toolbar of Synaptics, so that it would install the "tshark" package. If not, you must do so.

Start Synaptics and look for "tshark"; if it's installed, the checkbox for it should be green. If it's not green, check it, select "Mark for Installation" in the window that pops up, and click "Apply" in the toolbar.

even when I try to install it using "apt install tshark" I receive a message that the tshark package cannot be located.

If I do sudo apt install tshark on my Ubuntu 20.04 virtual machine, it prints

Reading package lists... Done
Building dependency tree       
Reading state information... Done
tshark is already the newest version (3.2.3-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

It also worked on my Ubuntu 21.04 virtual machine after I uninstalled it.

I also created a new 22.04 virtual machine, and, after doing sudo apt install wireshark, if I typed "tshark" it printed

Command 'tshark' not found, but can be installed with:
sudo apt install tshark

When I ran sudo apt install tshark, it installed the tshark package, and I could run tshark from the command line.

What version of Ubuntu are you running? (I'll be updating the 21.04 VM to 22.04 LTS, to allow testing of that.)running?

What command did you run to install tshark?

What wa the exact message it reported?