Why can't I access a port when I am trying to upload a sketch using the Arduino IDE with the Linux Mint operating system?
In the Arduino IDE under tools, the cursor just skips over Port. I have tried different USB ports.
The same setup using the same UNO and same cable has no trouble when I use Win 11 on a separate pc with the cursor on the Port it shows the port being connected to.
I am very new to Linux so any help would be appreciated.
Try
sudo adduser gaggymoon dialout
You may need to log out and back in for it to take effect.
Disclaimer: I haven't used Linux seriously for years.
Please post the output of lsusb. The output of this command will tell us which serial-to-usb converter is on the board.
Please run dmesg -w without the board connected; next connect the board and post the additional output that the command gives. After that, you can close dmesg using <ctrl>C. If you see anything related to BRLTTY, you will have to disable or unistall that.
As you're new to Linux, both commands are executed from a shell (command line / terminal).
@PaulRB, adding gaggymoon to the dialout group is indeed a step that needs to be taken. Not being a member of the dialout group will however result in some form of "access denied" message and @Gaggymoon is not getting to that point yet.
output of lsusb
Bus 002 Device 004: ID 1a86:7523 QinHeng Electronics CH340 serial converter
Bus 002 Device 003: ID 0461:4d15 Primax Electronics, Ltd Dell Optical Mouse
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 13d3:5130 IMC Networks Integrated Webcam
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
usb 2-1.2: new full-speed USB device number 7 using ehci-pci
[ 9440.884912] usb 2-1.2: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.54
[ 9440.884925] usb 2-1.2: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 9440.884929] usb 2-1.2: Product: USB2.0-Serial
[ 9440.885425] ch341 2-1.2:1.0: ch341-uart converter detected
[ 9440.886335] usb 2-1.2: ch341-uart converter now attached to ttyUSB0
[ 9441.443176] input: BRLTTY 6.4 Linux Screen Driver Keyboard as /devices/virtual/input/input22
[ 9441.536258] usb 2-1.2: usbfs: interface 0 claimed by ch341 while 'brltty' sets config #1
[ 9441.536927] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 9441.536956] ch341 2-1.2:1.0: device disconnected
I think I have got the info needed
Good 
How do I uninstall or disable BRLTTY?
You can remove it by
sudo apt remove brltty
You probably don't need it as it is a service for a braille display.
Thanks sterretje as your suggestions worked and thank you MrMark for info into removing brltty.
The tool menu now allows me to access Port and I can now upload a sketch.
Linux is a bit tricky for people such as myself as I am only familiar with windows.