SD card reader not detected in Ubuntu 16.04

Probably an installation-issue which can be resolved with re-installation?! This would concern package udisks2.

Reinstall package udisks2

sudo apt-get install --reinstall udisks2

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

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