Very strange bug in Ubuntu (introduced in recent months' updates)

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http://askubuntu.com – I have been using my ThinkPad x200 with Ubuntu since I bought it several yeas ago, every time doing a clean install when switching versions instead of upgrading one on top of the other. I have never had any issue with the hardware drivers, and Ubuntu, as usual, was quite pleasing. However, few months ago (I do not recall when exactly that happened, perhaps during May or June this year) I have noticed that when I boot the system, the WiFi is not available, that is: Hardware button is set to active On top-right corner I see the BT icon, but not the WiFi icon ifconfig / ip addr show the inter (HowTos)