I'm trying to install with apt but incountering some problems. When I typed "apt install ....rpm" it came up with the following problem:
Reading Package Lists... Done
Building Dependency Tree... Done
Selecting ... for '...rpm'
The following NEW packages will be installed:
...
0 upgraded, 1 newly installed, 0 removed and 2 not upgraded.
Need to get 0B/13.2MB of archives.
After unpacking 31.3MB of additional disk space will be used.
Checking GPG signatures...
Unknown signature /home/admin/Desktop/....rpm: (SHA1) DSA sha1 MD5 GPG NOT OK
E: Error(s) while checking package signatures:
0 unsigned package(s)
1 package(s) with unknown signatures
0 package(s) with illegal/corrupted signatures
E: Handler silently failed


How do I get it to install even though it has an unknown signature?

If you type apt-get --help

Then you should be presented with the different options or switches.

I think it's apt-get -f (-f meaning force)

So it would be

apt-get -f rpm
apt-get rpm -f

Something like that.


But there seems that there might be another problem regarding your GPG Key

Checking GPG signatures...
Unknown signature /home/admin/Desktop/....rpm: (SHA1) DSA sha1 MD5 GPG NOT OK

Seems that you need to import the GPG key.