This is a working reproducer:

sudo cp /var/lib/command-not-found/commands.db 
/var/lib/command-not-found/commands.db.tmp
sudo sqlite3 /var/lib/command-not-found/commands.db.tmp
SQLite version 3.31.1 2020-01-27 19:55:54
Enter ".help" for usage hints.
sqlite> PRAGMA locking_mode = EXCLUSIVE;
exclusive
sqlite> BEGIN EXCLUSIVE;
sqlite>

sudo rm /var/lib/command-not-found/commands.db.metadata
sudo PYTHONPATH=. ./cnf-update-db --verbose
Traceback (most recent call last):
  File "./cnf-update-db", line 26, in <module>
    col.create(db)
  File 
"/home/lukas/canonical/01-Distro/command-not-found/CommandNotFound/db/creator.py",
 line 92, in create
    con.executescript(create_db_sql)
sqlite3.OperationalError: database is locked

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https://bugs.launchpad.net/bugs/1875760

Title:
  /usr/lib/cnf-update-db:sqlite3.OperationalError:/usr/lib/cnf-update-
  db@26:create

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