[root@droplet mercurial-2.6.3]# hg debuginstall
checking encoding (ascii)...
checking Python lib (/usr/local/lib/python2.7)...
checking installed modules (/usr/local/lib/python2.7/site-packages/mercurial)...
checking templates (/usr/local/lib/python2.7/site-packages/mercurial/templates)...
checking commit editor...
checking username...
 no username supplied (see "hg help config")
 (specify a username in your configuration file)
1 problems detected, please check your install!