its always the 'verifying checksum signature'
Initially I had the same problem with slapt-get.
I have upgraded slapt-get to the latest 'c' version; and have rerun slapt-get, but the errors are always on the same part...is on the "verifying checksum signature" part of the process.
Now, i know that there is an option of "--no-md5" to override the MD5 checking, but is there an option to override the verifying checksum signature part.
***EDIT Ok... further analysis yielded that before all those new "verifying checksum signature" things will work, i have to perform the "--add-keys" option. Trying this new option yields the error "Invalid Crypto Engine" Which is my current path of investigation***