Ok, after the test above to run opera locally I am pretty sure that libgtk319 is not needed to run opera, it is just a packaging requirement. So for those who want to install opera69 in Ubuntu 16.04 you can just edit the debian control file to fix the libgtk3 requirement and then rebuild the deb. Here are the steps:

create a directory for editing and rebuilding the opera deb

mkdir opera_build

Download opera-stable_69.0.3686.57_amd64.deb and put it in the opera_build directory created above

cd opera_build

mkdir tmp

dpkg-deb -x opera-stable_69.0.3686.57_amd64.deb tmp

dpkg-deb --control opera-stable_69.0.3686.57_amd64.deb tmp/DEBIAN

This extracts the debian metadata in opera_build/tmp/DEBIAN, in it there is a control file

now edit the control file (still in opera_build)

gedit tmp/DEBIAN/control

change the requirement libgtk-3-0(>=3.19.12) to libgtk-3-0(>=3,18.9), then save.

Now rebuild the deb (still in the opera_build directory)

dpkg -b tmp opera-stable_69.0.3686.57_fixed_amd64.deb

this creates a new deb called opera-stable_69.0.3686.57_fixed_amd64.deb

now you can install this like you would normally with a deb and it no longer complains about libgtk3 version. Now when the pop up window comes up asking you if you want to update opera with rest of system, uncheck it, since next time there is an update you would need to go through this whole exercise again, apt upgrade will fail.

@ridgerunner said in can not install, dependency unsolvable (not gtk>=3.0 or whatever):

I have an older distro version and I am getting a message like others talk about in this missing dependency post. It was locked, so could not ask about it in there, and probably better to do a new post on it, since it is a dependency for a different library (not even giving me a problem about gtk-3.0 or whatever they were having, maybe I have just not got far enough into the unsatisfiable hell I forsee I might be entering into trying to get Opera to run.

The message I get is that libgbm1(>=17.1.0~rc2) is the unsatisfiable dependency. Will the same fix that worked in the linked post (by user kmod ) I put in above work on this i.e. I change that control file for a lower version of that library? Or is this libgbm1 library something that is definitely required at that version level or above in order for Opera to run correctly?

the only way to find out is if you try run opera locally and see if it works by just extracting it and run https://forums.opera.com/topic/41676/solved-missing-dependency/18

It would be helpful if you tell us which distro you are running, For Debian based distros you can find out your library version by running this command in the terminal.

dpkg -l | grep libgdm1

I have 18.0.5 on the Ubuntu 16.04 machine and the OS is pretty old, if you don't meet the requirement libgbm1>=17.1.0~rc2 your OS has probably reached end of life, so your problem may be different from the other thread in that Opera might really require a newer version of libgdm1 to run. But then some Debian versions (old stable or something) run very old software so maybe it is still supported.

As said in my post on the other thread I have since switched to Vivaldi, which is a fork of Opera with a similar UI. It has already upgraded several times on my 16.04 machine since I visited this forum last time and haven't had any issue. It turned out opera on Linux has other unresolved issues besides upgrading on older distros, e.g it is a long standing problem that Opera cannot play videos on some websites like Netflix. See many threads on this forum. I tested in on a fully up to date Ubuntu 20.04 machine and the newest version of Opera. indeed Netflix doesn't work.There are hacks and workarounds and bug reports but it has never been fixed. On the other hand Vivaldi just works. Well really shouldn't be advertising for the competition here, so I will stop.

there is a typo in the post above. temp should be tmp in the last two lines of codes.

Ok, after the test above to run opera locally I am pretty sure that libgtk319 is not needed to run opera, it is just a packaging requirement. So for those who want to install opera69 in Ubuntu 16.04 you can just edit the debian control file to fix the libgtk3 requirement and then rebuild the deb. Here are the steps:

create a directory for editing and rebuilding the opera deb

mkdir opera_build

Download opera-stable_69.0.3686.57_amd64.deb and put it in the opera_build directory created above

cd opera_build

mkdir tmp

dpkg-deb -x opera-stable_69.0.3686.57_amd64.deb tmp

dpkg-deb --control opera-stable_69.0.3686.57_amd64.deb tmp/DEBIAN

This extracts the debian metadata in opera_build/tmp/DEBIAN, in it there is a control file

now edit the control file (still in opera_build)

gedit tmp/DEBIAN/control

change the requirement libgtk-3-0(>=3.19.12) to libgtk-3-0(>=3,18.9), then save.

Now rebuild the deb (still in the opera_build directory)

dpkg -b tmp opera-stable_69.0.3686.57_fixed_amd64.deb

this creates a new deb called opera-stable_69.0.3686.57_fixed_amd64.deb

now you can install this like you would normally with a deb and it no longer complains about libgtk3 version. Now when the pop up window comes up asking you if you want to update opera with rest of system, uncheck it, since next time there is an update you would need to go through this whole exercise again, apt upgrade will fail.

@vbnvbn said in [Solved] Missing dependency:

It seems there is nothing to do but install a newer version of Ubuntu or another linux distribution.

Any other suggestions?

Yes, there is another way.

You can download the .deb, right click and extract it with file roller like you do with any archive (instead of installing it) then extract data.tar.xz with file roller, then in the terminal run

/path/to/opera-stable_69.0.3686.57_amd64/usr/bin/opera

Opera starts here and seems working, I went to Youtube and checked my email, went to a few random sites, so maybe libgtk 3.19 is not really needed to run opera, just a packaging requirement. But I haven't tested it much, like I said I have switched to Vivaldi.

If it complains about missing libraries in the terminal type (or just do it anyway in case you are missing something but opera still starts)

ldd  /path/to/opera-stable_69.0.3686.57_amd64/usr/bin/opera

and install whatever libs that are "not found" in the output.

I got this error when starting opera in the terminal

ERROR:child_thread_impl.cc(792)] Receiver for unknown Channel-associated interface: chrome.mojom.SearchBouncer

Seems to be related to glibc https://forums.opera.com/topic/38293/solved-opera-66-0-3515-72-1-crashing-without-any-extension-or-new-installation/49, but opera doesn't crash on me, everything is working normally, so maybe it is harmless (though I haven't tested too much, there may be use cases where it is important, and I missed them I don't know)

If everything works you can make a .desktop file and manually update everytime (replace the folder with a new one) I can't be bother with it myself, but yeah, looks like it can be done

EDIT: Ok, the error is harmless. I started opera in Ubuntu 20.04 and get the same error but everything there works fine.

@anab said in [Solved] Missing dependency:

@leocg To all who are interested. The answer in the following post solves the problem for me. GTK upgrade and Opera update without any problem on my side:
https://askubuntu.com/questions/933010/how-to-upgrade-gtk-3-18-to-3-20-on-ubuntu-16-04#

I know that method but it is risky to upgrade gtk3 that's why I didn't post the link here. A lot of it would depend on your DE and the applications you use. Glad that it works out for you. But I have switched to Vivaldi, problem solved (opera is never my main broswer anyway. Firefox is)

It is not recommended to upgrade gtk3 on Ubuntu (even if doable) because it may render some your applications non working or even break your desktop. Ugrading gtk to 3.19 is a non starter. Not going to kill my system because of opera.