In any case, United's assaulting arms stockpile blew the Italians away after the break as Marcus Rashford and Harry Maguire drew them level before Ronaldo fueled home a header a short ways from time.
Ronaldo additionally scored a 96th-minute victor against Villarreal in United's past Champions League game to cover a generally unconvincing presentation.
Inquiries will keep on being posed of Solskjaer's capacity to get the best out of a lavishly gifted crew.
In any case, a truly necessary success to move to the highest point of Group F facilitates the mounting strain on the Norwegian.
Solskjaer reacted to Saturday's 4-2 loss at Leicester by dropping Jadon Sancho and Paul Pogba.
Rashford was given his initial beginning of the period after shoulder a medical procedure and ought to have scored after only three minutes when he terminated wide when clean through on objective, albeit the offside banner was subsequently raised against the England worldwide.
Joined's serious issues, however, have come at the opposite end as they have now kept one clean sheet in 20 games.
Atalanta played through the hosts effortlessly for the initial objective as Josip Ilicic took care of Davide Zappacosta down the right and his low cross was turned home by Pasalic.
Fred was denied a moment equalizer by a splendid save from Juan Musso before United were effectively penetrated once more.
Maguire persevered through a sweltering return from injury against his previous club at the end of the week and was outjumped by Demiral as the Turkish protector headed home from a corner.
Old Trafford was becoming fretful, yet fortunately for United they were facing a protection as suspect as their own.
Fred terminated another tremendous possibility wide before Rashford hit the bar with only Musso to beat before the break.
Rashford at last discovered his reach to split the house side's deficiency with a quiet completion from Bruno Fernandes' pass eight minutes into the subsequent half.
Scott McTominay then, at that point, discharged against the post and Musso had to full stretch to turn a low Ronaldo shot to wellbeing.
Solskjaer emptied his abundance of assaulting choices off the seat as Pogba, Sancho and Edinson Cavani were presented for the last quarter.
In any case, United's dreadful shielding almost gave them an over the top mountain to ascend.
Duvan Zapata turned Victor Lindelof effortlessly and constrained David de Gea into a staggering recovery before the Spaniard parried Ruslan Malinovskyi's subsequent strike over.
It required only two minutes to demonstrate the worth of those recoveries as Maguire pounded home at the back post from Cavani's flick-on.
Fernandes ought to have finished the rebound when he terminated excessively near Musso.
In any case, that made room for Ronaldo to give another fantasy finishing as he rose most elevated to control home Luke Shaw's cross for his 6th objective in nine appearances since getting back to the club where he initially turned into a world star.
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