How can I install the package qtbase-abi-5-9-5 in Ubuntu 19.10? I cannot find this package in the package search.

I need this to allow the installation of this government application from https://www.autenticacao.gov.pt/cc-software: https://www.autenticacao.gov.pt/documents/10179/11962/Autenticacao.gov_Ubuntu_18_x64.deb

It was made for Ubuntu 18 but it only requires the qtbase to run.

UPDATE 1: Did not work. I already have installed the libqt5core5a but keeps asking for the qtbase-abi-5-9-5:

libqt5core5a is already the newest version (5.12.4+dfsg-4ubuntu1.1) 
  • You best ask the providers of that software for an updated version - or you install 18.04 in a virtual machine.
    – guntbert
    Feb 16, 2020 at 22:56

3 Answers 3


qtbase-abi-5-9-5 is a virtual package used only in Ubuntu 18.04, it references the libqt5core5a package (see here) which is available in all currently supported releases, including 19.10:

sudo apt install libqt5core5a

Note that I was not able to find that with the search function on packages.ubuntu.com itself, but used a startpage search instead.

If the program tests for a package called qtbase-abi-5-9-5 instead of the qt5 library from the above package I’d just fake the package with equivs, see this answer and the steps here.


I had the same problem with the same app, so do the following.

  1. Download the .deb package
  2. Install dependencies sudo apt install libcurl3-nss libnsspem libxerces-c3.2 libxml-security-c20 binutils
  3. Uncompress the deb file using binutils: ar -x $YOUR_PACKAGE_NAME$.deb
  4. Uncompress the control file: tar xf control.tar.xz
  5. Edit the control file and remove unwanted dependencies or in this case sed -i 's|, qtbase-abi-5-12-4||g' control
  6. Recompress the content file : tar cfJ control.tar.xz control md5sums postinst postrm
  7. Remove the uncompressed files rm control md5sums postinst postrm
  8. Rebuild the .deb file : ar rcs $NEW_PACKAGE_NAME$.deb debian-binary control.tar.xz data.tar.xz
  9. Install it with: sudo dpkg -i $NEW_PACKAGE_NAME$.deb

New download versions were recently published for 18.04, 19.10 and 20.04:


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.