Smith averaged 3.1 points and 2.5 rebounds in 31 games last season.
Chol Marial, Donta Scott and Joshua Tomaic remain the Terps' only frontcourt options for next season.
Lindo averaged 1.7 points and 1.9 rebounds in just under seven minutes of game time as a sophomore.
The forward's decision leaves the Terps' frontcourt depth thin.
Aiken committed to Seton Hall, leaving the Terps with two open scholarships.
Lindo is the third front court player to transfer away from the Terps, following Makhel and Makhi Mitchell.
The Big Ten and NCAA tournaments were cancelled due to the coronavirus outbreak.
The Terps look to get back in the win column and clinch a share of the Big Ten title on Senior Day
Maryland is looking to bounce back from its first home loss of the season.
The Terps control their own destiny en route to a Big Ten regular-season title.