strace is basically my first go-to when a command immediately fails with an obscure message.
strace, skim the last 4-5 pages of trace output before the error message is emitted, looking in particular for error return values (it's often not right before the error because the program has started to clean up). Figures out the problem 80% of the time within a couple of minutes.
strace, skim the last 4-5 pages of trace output before the error message is emitted, looking in particular for error return values (it's often not right before the error because the program has started to clean up). Figures out the problem 80% of the time within a couple of minutes.