Thank you for your response
They are in /var/cache/apt/archives and there are 3700
An example acpid 18.104.22.168 pclos.i586 rpm
Yes, you can delete them. You can also avoid
their build up
in the future.
, Settings --> Preferences --> Files
tab, set the second option to Delete
your packages after installation.
To delete those already there, click the Delete Cached Package Files