Grubauer made 31 saves for Seattle (10-20-4) in his return to Colorado after signing a six-year contract with the Kraken as an unrestricted free agent on July 28. Jared McCann had a goal and assist.
"I wasn't sure if they were boos or 'Gruus' (from the crowd) coming back here," said Grubauer, who played three seasons with the Avalanche and was a Vezina Trophy finalist last season. "If it was a 'Gruus,' I definitely appreciate it. The love and the appreciation and the support I got here, it's been incredible. Denver is always a special place in my heart, especially the fans, too, and the people come out. It feels amazing for sure."
The Kraken played their first game since a 5-2 loss to the Vancouver Canucks on Jan. 1.
"We played a darn good hockey game, but at the end of the day, you have to address what the result is," Seattle coach Dave Hakstol said. "We didn't come here to play a good hockey game, we came to win a hockey game. This is a tough building to win in. These guys are good here, they're a [heck] of a team, but this is about us."
The Avalanche took a 1-0 lead at 5:50 of the first period when Aube-Kubel scored from the slot off a drop pass from Logan O'Connor.
Marcus Johansson tied 1-1 at 9:16, tipping McCann's point shot under Francouz's left arm on a power play. McCann made it 2-1 at 4:49 of the second period on a bad angle shot from near the left wing boards.
Colin Blackwell increased the lead to 3-1 at 14:20 with a deflection of Jamie Oleksiak's point shot.
Aube-Kubel cut it to 3-2 at 17:00 when he converted the rebound of Burakovsky's shot.
"I talked to them after the second period and I sensed some frustration from our guys, the second period especially," Colorado coach Jared Bednar said. "You've got to give Seattle credit, they checked hard. We did not do some of the things that we wanted to do, especially on our entries. We turned the puck over a lot, we played in front of their defense, we were forcing things into a crowd.
"Third period, we dialed it up a bit, one or two notches, and were able to do more that we wanted. We'll take the win, but there's certainly some things that we can take a look at."