diff -up src/sage/databases/cremona.py.orig src/sage/databases/cremona.py --- src/sage/databases/cremona.py.orig 2020-10-24 11:37:59.000000000 -0600 +++ src/sage/databases/cremona.py 2020-10-30 14:02:27.778960819 -0600 @@ -854,7 +854,8 @@ class MiniCremonaDatabase(SQLDatabase): message = "There is no elliptic curve with label " \ + label + " in the default database; try installing " \ + "the optional package database_cremona_ellcurve which " \ - + "contains the complete Cremona database" + + "contains the complete Cremona database: " \ + + "sudo dnf install sagemath-data-elliptic_curves_large" raise ValueError(message) ainvs = eval(c[0]) data = {'cremona_label': label, @@ -1659,6 +1660,7 @@ class LargeCremonaDatabase(MiniCremonaDa con.executemany("UPDATE t_curve SET gens=? WHERE curve=?", \ curve_data) print("Committing...") + self.commit() if largest_conductor and int(v[0]) > largest_conductor: break