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I was installing GNU octave on my Ubuntu 18.04 (from the terminal). After installation octave wouldn't open when I tried to launch it using the desktop icon. So I tried launching from the terminal and this showed up

/usr/lib/x86_64-linux-gnu/octave/4.2.2/exec/x86_64-pc-linux-gnu/octave-gui:

error while loading shared libraries:

libQt5Network.so.5: cannot open shared object file: No such file or directory

I tried uninstalling/reinstalling with sudo apt-get remove octave and installed again after re-boot yet the problem persists.

I even tried this

sudo apt-get update && sudo apt-get install libqt5network5

But the result was

libqt5network5 is already the newest version (5.9.5+dfsg-0ubuntu1)

I'm confused that it says no such file or directory even though the relevant package is already installed

I'm not entirely sure about this but when I first installed octave it said around 300+ MB of data will be used for it. I left my computer on to install octave and returned after it finished. After I found this problem i uninstalled + reinstalled octave but when I was reinstalling it said 4,664 kB will be used.

Since I left my computer during installation I belive it went back to the login screen when I returned to see the installation was done. Is it possible that this corrupted the library?

$ sudo apt-get dist-upgrade

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Calculating upgrade... Done

The following packages will be upgraded:

  python3-distupgrade ubuntu-release-upgrader-core ubuntu-release-upgrader-gtk

3 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Need to get 139 kB of archives.

After this operation, 1,024 B of additional disk space will be used.

Do you want to continue? [Y/n] y

Get:1 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 ubuntu-release-upgrader-gtk all 1:18.04.22 [9,364 B]

Get:2 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 ubuntu-release-upgrader-core all 1:18.04.22 [24.4 kB]

Get:3 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python3-distupgrade all 1:18.04.22 [105 kB]

Fetched 139 kB in 3s (52.8 kB/s)              

(Reading database ... 199458 files and directories currently installed.)

Preparing to unpack .../ubuntu-release-upgrader-gtk_1%3a18.04.22_all.deb ...

Unpacking ubuntu-release-upgrader-gtk (1:18.04.22) over (1:18.04.21) ...

Preparing to unpack .../ubuntu-release-upgrader-core_1%3a18.04.22_all.deb ...

Unpacking ubuntu-release-upgrader-core (1:18.04.22) over (1:18.04.21) ...

Preparing to unpack .../python3-distupgrade_1%3a18.04.22_all.deb ...

Unpacking python3-distupgrade (1:18.04.22) over (1:18.04.21) ...

Processing triggers for man-db (2.8.3-2) ...

Setting up python3-distupgrade (1:18.04.22) ...

Setting up ubuntu-release-upgrader-core (1:18.04.22) ...

Setting up ubuntu-release-upgrader-gtk (1:18.04.22) ...

$ ldd /usr/lib/x86_64-linux-gnu/octave/4.2.2/exec/x86_64-pc-linux-gnu/octave-gui

    libQt5Network.so.5 => not found

    libQt5Widgets.so.5 => not found

    libQt5Gui.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Widgets.so.5 => not found

    libQt5Gui.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Widgets.so.5 => not found

    libQt5Gui.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Widgets.so.5 => not found

    libQt5Gui.so.5 => not found

    libQt5Core.so.5 => not found

$ cat /etc/ld.so.conf /etc/ld.so.conf.d/* and env | grep LD, and ls -l /usr/lib/*/libQt5Network*

include /etc/ld.so.conf.d/*.conf



# libc default configuration

/usr/local/lib

# Multiarch support

/usr/local/lib/x86_64-linux-gnu

/lib/x86_64-linux-gnu

/usr/lib/x86_64-linux-gnu



ls: cannot access '/usr/lib/*/libQt5Network*': No such file or directory

$ sudo apt install --reinstall libqt5network5

Reading package lists... Done

Building dependency tree       

Reading state information... Done

0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.

Need to get 634 kB of archives.

After this operation, 0 B of additional disk space will be used.

Get:1 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 libqt5network5 amd64 5.9.5+dfsg-0ubuntu1 [634 kB]

Fetched 634 kB in 30s (20.8 kB/s)                                              

(Reading database ... 196636 files and directories currently installed.)

Preparing to unpack .../libqt5network5_5.9.5+dfsg-0ubuntu1_amd64.deb ...

Unpacking libqt5network5:amd64 (5.9.5+dfsg-0ubuntu1) over (5.9.5+dfsg-0ubuntu1) ...

Setting up libqt5network5:amd64 (5.9.5+dfsg-0ubuntu1) ...

Processing triggers for libc-bin (2.27-3ubuntu1) ...

i got another error with libQt5Widgets.so.5, and so i tried the same solution and it worked. Then i got an error with libQt5Gui.so.5 and i tried the same solution and it worked.

But then came libQt5Core.so.5. I tried the same thing i.e sudo apt-get update && sudo apt install --reinstall libqt5core5

$ sudo apt-get update && sudo apt install --reinstall libqt5core5

Hit:1 http://in.archive.ubuntu.com/ubuntu bionic InRelease                     

Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]    

Get:3 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   

Get:4 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] 

Hit:5 https://deb.opera.com/opera-stable stable InRelease 

Fetched 247 kB in 3s (82.7 kB/s)

Reading package lists... Done

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package libqt5core5

$ ldd /usr/lib/x86_64-linux-gnu/octave/4.2.2/exec/x86_64-pc-linux-gnu/octave-gui | grep not

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

    libQt5Core.so.5 => not found

Edit: After some digging i found out the command to reinstall libqt5core was sudo apt-get install --reinstall libqt5core5a (I didnt know the "a" part).

Reading package lists... Done

Building dependency tree       

Reading state information... Done

0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.

Need to get 2,035 kB of archives.

After this operation, 0 B of additional disk space will be used.

Get:1 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 libqt5core5a amd64 5.9.5+dfsg-0ubuntu1 [2,035 kB]

Fetched 2,035 kB in 19s (105 kB/s)                                             

(Reading database ... 201031 files and directories currently installed.)

Preparing to unpack .../libqt5core5a_5.9.5+dfsg-0ubuntu1_amd64.deb ...

Unpacking libqt5core5a:amd64 (5.9.5+dfsg-0ubuntu1) over (5.9.5+dfsg-0ubuntu1) ...

Setting up libqt5core5a:amd64 (5.9.5+dfsg-0ubuntu1) ...

Processing triggers for libc-bin (2.27-3ubuntu1) ...

After installing it then I had more libs to install..
namely

libdouble-conversion.so.1

you can install it using

sudo apt-get install --reinstall libdouble-conversion1

then

libQt5Svg.so.5

installed using

sudo apt-get install --reinstall libqt5svg5

I suppose this partially fixed the problem but still has not solved it.
I can now open the CLI interface of octave using the command /usr/bin/octave-cli OR octave-cli

But when I simply run octave from the terminal, I get an error

octave exited with signal 6

I can't open Octave using the Desktop icon or the icon from Application menu yet.

Edit: Since I tried so many ways so fix the problem with little success i decided to just re-install my Ubuntu partition. With less fuss I got it all fixed. I assume it might have been a slow internet speed which might have ruined my Ubuntu installation the first time because this problem of shared libraries I had was common to other KDE-based packages like kile and okular. Re-installing fixed the problem so I'd suggest anyone who has less data to backup do so.