My camera is a Sony A350, the card is a compact flash.
I am using an Acer Aspire TC i7 Desktop.
I tried using card reader nothing shows up on the computer.
When I go to the software manager and click on gphoto2, when the page to come up where it says Launch and remove in the centre it says No screenshots available.
When I click on Launch nothing happens.
It's probably wise to first determine whether the kernel can detect the flashcard in the card reader. If it can't, then that method of managing the flashcard won't be available.
A straight forward way of testing whether the flashcard can be seen by the kernel, is to open a terminal, and run the following command, perhaps as root if you need to:
Depending on the type of card reader you have, that is, whether it's internal to the computer, or whether it is a separate unit that attaches to the computer through a usb socket, you can test the flashcard.
To test, watch the terminal screen whilst plugging in the flashcard. If the output on the screen shows some information on the "new" device, then that's a good start. If the information on screen identifies the flashcard with any or all of a product name and manufacturer name and perhaps a device name, then the kernel sees the device and it should be accessible to you one way or another.
If there are error messages or a failure to show information about the flashcard, then the kernel has trouble with it, and it likely won't be accessible to the system. To close the dmesg output, hit ctrl+c in the terminal.
If you are uncertain as to the meaning of the output, perhaps paste it here and readers will be able to comment.