sudo aptitude upgrade

Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.

 sudo aptitude download minicom

...
Get:1 http://us.archive.ubuntu.com feisty/main minicom 2.2-4build1 [168kB]
Fetched 1B in 0s (2B/s)

 sudo aptitude install minico

...
Need to get 0B/265kB of archives. After unpacking 1401kB will be used.
Do you want to continue? [Y/n/?] n

 sudo aptitude remove minicom

...
The following packages are unused and will be REMOVED:
lrzsz
The following packages will be REMOVED:
minicom
0 packages upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 1401kB will be freed.
Do you want to continue? [Y/n/?]

 ls /var/cache/apt/archives/

 sudo aptitude clean

Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done