jtag not working with Arria 10 GX FPGA Dev Kit

We have an Arria 10 GX Dev Kit that we've been using for a couple years and it was working fine (Ubuntu 16.04, Intel FPGA SDK for OpenCL 18.0). The other day, I updated the Intel FPGA SDK to version 19.1 (I now have both versions installed, but all my paths point to version 19.1). Ever since I did that, the usb blaster stopped working. When I first plug the FPGA into the usb port, I can see it in "lsusb" as the following:

Bus 002 Device 005: ID 09fb:6810 Altera 

And "dmesg | tail" gives the following output:

[  183.109435] usb 2-1.7: new high-speed USB device number 5 using ehci-pci
[  183.217853] usb 2-1.7: New USB device found, idVendor=09fb, idProduct=6810
[  183.217856] usb 2-1.7: New USB device strings: Mfr=0, Product=0, SerialNumber=0

Next, when I run jtagconfig, it first shows "connecting to servers [...]' but then it displays the message " No jtag hardware available", and running "dmessage|tail" now shows

[  294.061479] usb 2-1.7: USB disconnect, device number 5
[  295.598535] usb 2-1.7: new high-speed USB device number 6 using ehci-pci
[  300.838369] usb 2-1.7: device descriptor read/64, error -110

Any ideas what the issue might be?