title: cannot install qtbase-abi-5-5-1 on ubuntu 17.10
body: <p>When I install a <code>fcitx</code> related package an error show that <code>qtbase-abi-5-5-1</code> is needed but not installed.</p>
  
  <pre><code>wsx@wsx:~/Downloads$ sudo apt install ./fcitx-frontend-qt5-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb ./libfcitx-qt5-1-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Note, selecting 'fcitx-frontend-qt5-rstudio' instead of './fcitx-frontend-qt5-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb'
  Note, selecting 'libfcitx-qt5-1-rstudio' instead of './libfcitx-qt5-1-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb'
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   fcitx-frontend-qt5-rstudio : Depends: qtbase-abi-5-5-1 but it is not installable
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>I tried using command <code>sodu apt install qtbase-abi-5</code> to find the package but failed. I then download the <code>.deb</code> package from <a href="https://ubuntu.pkgs.org/16.04/ubuntu-updates-main-amd64/libqt5core5a_5.5.1+dfsg-16ubuntu7.5_amd64.deb.html" rel="nofollow noreferrer">https://ubuntu.pkgs.org/16.04/ubuntu-updates-main-amd64/libqt5core5a_5.5.1+dfsg-16ubuntu7.5_amd64.deb.html</a> but it was not work, the page show that this <code>.deb</code> package provide the <code>qtbase-abi-5</code> package. Interestingly, I can find few information about this error by google. Some info from <code>Ask ubuntu</code> forum say that it seems the <code>qtbase-abi-5</code> is not included in <code>libqt5core5a</code>. </p>
  
  <p>I don't know how to fix it. Can you give me some suggestion or some link which do can download <code>qtbase-abi-5</code> ?</p>
  
  <hr>
  
  <p>Thanks @GAD3R for your answer, I am sorry that it fails. </p>
  
  <pre><code>wsx@wsx:~$ sudo apt-cache search qtbase-abi
  libqt5core5a - Qt 5 core module
  wsx@wsx:~$ sudo apt install libqt5core5a
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  libqt5core5a is already the newest version (5.9.1+dfsg-10ubuntu1).
  0 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
  wsx@wsx:~$ sudo apt install ./Downloads/fcitx-frontend-qt5-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb ./Downloads/libfcitx-qt5-1-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Note, selecting 'fcitx-frontend-qt5-rstudio' instead of './Downloads/fcitx-frontend-qt5-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb'
  Note, selecting 'libfcitx-qt5-1-rstudio' instead of './Downloads/libfcitx-qt5-1-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb'
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   fcitx-frontend-qt5-rstudio : Depends: qtbase-abi-5-5-1 but it is not installable
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p><strong>Can anyone run following commands successfully?</strong></p>
  
  <p><code>
  $ wget http://ikuya.info/tmp/fcitx-qt5-rstudio-qt542.tar.gz 
  $ tar xf fcitx-qt5-rstudio-qt542.tar.gz 
  $ sudo apt install ./fcitx-frontend-qt5-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb ./libfcitx-qt5-1-rstudio_1.0.5-1ubuntu1~qt542_amd64.deb
  </code></p>