the pi doesn't run debian, it runs raspbian, so probably https is not supported on the raspbian repo's. certainly downloading a debian package won't work on the pi. These are specific instructions to install Sonarr on Raspbian.
1 Add lamb and garlic. 2  Stir the lamb to break up, about 5 minutes. 3  Stir in tomato paste and cook for 1 to 2 minutes. 4  Stir in carrots, bell pepper, bay leaf, cumin, salt, black pepper and parsley. 5  Saute until carrots are soft. 6  Add water and bring to a boil. Stir the lamb to break up, about 5 minutes. 2  Stir in tomato paste and cook for 1 to 2 minutes. 3  Stir in carrots, bell pepper, bay leaf, cumin, salt, black pepper and parsley. 4  Saute until carrots are soft. 5  Add water and bring to a boil. 6  Turn heat to low and simmer, covered, about 30 minutes.
Preheat oven to 325Â°. Roast lamb, basting occasionally and adding water by 1/4-cupfuls if pan is dry, until meat is completely tender and pulling easily away from the bones, 4â4 1/2 hours (be sure to secure foil tightly around the roasting pan each time you finish basting the lamb). Remove lamb from oven and uncover. Preheat broiler. Broil lamb, basting occasionally, until fat is golden brown and crisp, 5â7 minutes. Transfer lamb to a serving platter. Spoon fat from surface of juices in pan; discard fat. Pour juices into a pitcher and serve alongside lamb.