user62667: I have an Arduino UNO (clone, not original) that was working fine until a couple of days ago. Now, it does not show up when I connect it to my laptop.
Things that I've troubleshouted:

USB cable is fine (tried with another Arduino).
USB ports are fine (tried with another Arduino).
Followed all the fixes and checks listed
here
and everything is successful.
I can upload sketches trough ICSP using a working Arduino. 
I've tailed syslog while connecting and disconnecting the failing
Arduino and nothing shows up (it does when using the "good one").
I've tried on a Windows 10 machine and it doesn't show up.

What else can I try? 

user62694: I can't comment yet but have you updated your board manger for UNO on unbunto?
tools > Board > Board Manger > Search UNO
Kind of dumb to have to do that but it happen to me before and this was the solution I did. 

62667: <p>I have an Arduino UNO (clone, not original) that was working fine until a couple of days ago. Now, it does not show up when I connect it to my laptop.</p>

<p>Things that I've troubleshouted:</p>

<ol>
<li>USB cable is fine (tried with another Arduino).</li>
<li><p>USB ports are fine (tried with another Arduino).</p></li>
<li><p>Followed all the fixes and checks listed
<a href="https://arduino.stackexchange.com/questions/13292/have-i-bricked-my-arduino-uno-problems-with-uploading-to-board?newreg=3f52658e2bbc4b77969435f443c1bccf">here</a>
and everything is successful.</p></li>
<li><p>I can upload sketches trough ICSP using a working Arduino. </p></li>
<li><p>I've tailed <code>syslog</code> while connecting and disconnecting the failing
Arduino and nothing shows up (it does when using the "good one").</p></li>
<li><p>I've tried on a Windows 10 machine and it doesn't show up.</p></li>
</ol>

<p>What else can I try? </p>
 62694: <p>I can't comment yet but have you updated your board manger for UNO on unbunto?</p>

<p>tools > Board > Board Manger > Search UNO</p>

<p>Kind of dumb to have to do that but it happen to me before and this was the solution I did. </p>
