i also had this happen to my sever install. this is what was in sources.list by default: https://paste.ubuntu.com/p/n8w6PfkQ3R/
i used post #27: https://bugs.launchpad.net/subiquity/+bug/1783129/comments/27 to add to my list: https://paste.ubuntu.com/p/6KHg4QPXvF/
i also had this happen to my sever install. this is what was in sources.list by default: /paste. ubuntu. com/p/n8w6PfkQ3 R/
https:/
i used post #27: https:/ /bugs.launchpad .net/subiquity/ +bug/1783129/ comments/ 27 to add to my list: /paste. ubuntu. com/p/6KHg4QPXv F/
https:/