Same here. Lucky me had a flat on my first muni ride ever 
. I repaired the puncture (presumably made by a thorn) with a Park Tool GP-2 patch. Cleaned the area with isopropylic alcohol, roughened it up, cleaned it again with alcohol and after letting it dry I applied the patch. Then I put some weight on it and left it like that overnight. I‘m not saying that all of these steps are required - it‘s just how I did it.
That was about a month ago. So far so good. I’m riding it most of the time at around 15PSI in a 26x4 tire - yeah, more road than muni. I really need a 29er road uni… …and it‘s only a matter of time, I‘m considering different options at the moment 
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