SD card reader not detected in Ubuntu 16.04
Probably an installation-issue which can be resolved with re-installation?! This would concern package
sudo apt-get install --reinstall udisks2
Reboot the machine
SD cards should be recognized then, after inserting them (in and out and in cautiously).
I am guessing you have Realtek card reader?
Download the Linux driver for your Realtek device for example rts5159 Open a new terminal session
Install the driver. Run the following commands:
cd where-your-driver-was-downloaded-extracted make sudo make install sudo depmod
If you have installed a Card reader
lsusb should give you something like:
Bus 001 Device 005: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller