I get this error:
collect2: error: ld returned 1 exit status
/usr/src/asterisk-13.19.1/Makefile.rules:176: recipe for target 'chan_pjsip.so' failed
make[1]: *** [chan_pjsip.so] Error 1
Makefile:378: recipe for target 'channels' failed
make: *** [channels] Error 2
Please give us links to download asterisk server in Ubuntu 16.04!