Presuming the punctures are on the outer aspect of the tube (not caused by something on the rim) and you've carefully checked the tire to make sure whatever caused the first puncture was removed, seems like bad luck.
I use a bright light to inspect the tube and run my bare hand along it. Sometimes you can feel what caused the puncture before you see it. Anti puncture tire liners work pretty well too
I use a bright light to inspect the tube and run my bare hand along it. Sometimes you can feel what caused the puncture before you see it. Anti puncture tire liners work pretty well too