PS. Here's the error log from this of the recommended solutions (pasted below, seperated by dashed lines).
And I'm not so sure I understand the rest of the suggestions, starting with "Package dependency problems may occur when installing in unstable/testing..." and below on the recommended webpage. Thanks!
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#apt-get upgrade -f
apt upgrade is unsafe on rolling release distributions.
using apt full-upgrade instead
use apt upgrade --force to override
Hit:1
https://deb.parrot.sh/parrot rolling InRelease
Hit:2
https://deb.parrot.sh/parrot rolling-security InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
---------------------------
#apt upgrade --force
apt upgrade is unsafe on rolling release distributions.
using apt full-upgrade instead
use apt upgrade --force to override
Hit:1
https://deb.parrot.sh/parrot rolling InRelease
Hit:2
https://deb.parrot.sh/parrot rolling-security InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
--------------------------
apt-get dist-upgrade -f
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
----------------------------