kleopatra will not export private certificates instaed exporting the public cert only

Install kleopatra,
Generate public/private key pair
Export the private key to file

The file will only hold the public key.

To export the private key side by side with the public one you'll have to open a commandline and use gpg.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: kleopatra 4:19.12.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-55.61-generic 5.4.73
Uname: Linux 5.4.0-55-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Thu Nov 19 02:05:36 2020
InstallationDate: Installed on 2011-10-19 (3318 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: kleopatra
UpgradeStatus: Upgraded to focal on 2019-04-27 (571 days ago)