APT checks this and shows you the information:
Need to get 8314 kB of archives.
After this operation, 30.3 MB of additional disk space will be used.
It also errors out if you do not have enough free space:
"You don't have enough free space in %s"
** Changed in: apt (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/561238
Title:
apt does not check Free Disk Space before upgrading
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