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Actually, there's another process is running in another terminal. Seems like that is installing something or update or upgrading your system. That's why `dpkg -i` returned that
>database is locked by another process.

[Some says](https://askubuntu.com/a/1109989) to remove the file `/var/lib/dpkg/lock`. But, I highly recommend not to remove that file cause it's likely to kill your process. Sometimes, **your system might crash for it either**.