Hi Morgon,
I can't add much of use to your question, but I can report that I am also unable to install early perls on Ubuntu 16 with perlbrew. This did not seem to be the case on Ubuntu 14, though I no longer have an installation around to verify. For example:
$ perlbrew install 5.12.5
Test Summary Report
-------------------
op/numconvert.t (Wstat
+: 0 Tests: 1440 Failed: 12)
Failed tests: 104, 108, 112, 136, 140, 144, 152, 156
160, 168, 172, 176
op/range.t (Wstat
+: 0 Tests: 141 Failed: 25)
Failed tests: 84-95, 99-111
op/stash.t (Wstat
+: 0 Tests: 31 Failed: 0)
TODO passed: 26
Files=1802, Tests=349166, 423 wallclock secs (17.90 usr 5.52 sys + 15
+7.80 cusr 11.04 csys = 192.26 CPU)
Result: FAIL
makefile:970: recipe for target 'test_harness' failed
make: *** [test_harness] Error 37
##### Brew Failed #####
The way forward always starts with a minimal test.
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