Package: swi-prolog Version: 8.0.2+dfsg-3 pack_install stopped working due to swi-prolog upstream servers switching from http to https, as documented here: https://swi-prolog.discourse.group/t/www-swi-prolog-org-goes-https/811/2
Upstream has fixed this in commit 2f36f408be0abc1f6d4915534334fece26af5450, which is a one-line fix that changes the URL of the server to contact from http to https. I suggest backporting this fix into the debian package as well. Here's a transcript demonstrating the bug: ?- pack_install(uuid). % Contacting server at http://www.swi-prolog.org/pack/query ... ERROR: url `'https://www.swi-prolog.org/pack/query'' does not exist (status(500,Internal Server Error)) ERROR: In: ERROR: [18] throw(error(existence_error(url,' https://www.swi-prolog.org/pack/query'),context(_8254,...))) ERROR: [16] http_open:try_http_proxy(direct,[uri(' http://www.swi-prolog.org/pack/query'),...|...],_8290,[post(...),...]) at /usr/lib/swi-prolog/library/http/http_open.pl:425 ERROR: [14] <meta call> ERROR: [13] '$sig_atomic'(prolog_pack:http_open(' http://www.swi-prolog.org/pack/query',_8384,...)) <foreign> ERROR: [12] setup_call_catcher_cleanup(prolog_pack:http_open(' http://www.swi-prolog.org/pack/query',_8428,...),prolog_pack:read_reply(_8440,_8442,_8444),_8414,prolog_pack:close(_8454)) at /usr/lib/swi-prolog/boot/init.pl:469 ERROR: [10] prolog_pack:query_pack_server(locate(uuid),_8486,[]) at /usr/lib/swi-prolog/library/prolog_pack.pl:1733 ERROR: [9] prolog_pack:pack_default_options(uuid,uuid,[],_8528) at /usr/lib/swi-prolog/library/prolog_pack.pl:516 ERROR: [8] prolog_pack:pack_install(uuid) at /usr/lib/swi-prolog/library/ prolog_pack.pl:457 ERROR: [7] <user> ERROR: ERROR: Note: some frames are missing due to last-call optimization. ERROR: Re-run your program in debug mode (:- debug.) to get more detail.
