Set up Altera USB Blaster II on Ubuntu Linux?

You should have a udev rule for it under /etc/udev/rules.d/ Refer to the man page for information on where rules are located and how they are processed: https://man7.org/linux/man-pages/man7/udev.7.html From a terminal, determine the Vendor and Device ID for your USB Blaster:

$ lsusb | grep -i altera
Bus 001 Device 010: ID 09fb:6010 Altera USB-BlasterII

Next, add this information to your USB rules file. If you don't already have it, create one:

$ sudo vi /etc/udev/rules.d/92-usb.rules

SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6010", MODE="0666"

The final step is to either restart the udev service or reboot your PC. The latter is recommended. Once you have completed the steps above, you should see something similar as shown in the attached Signal Tap screenshot.