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up vote 61 down vote favorite
13

enter image description here

com.canonical.unity.webapps
In order to work properly, Unity Tweak Tool recommends you install the necessary packages

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I have uploaded a screenshot of the problem. Please check it out. – Muddassir Nazir Apr 18 '14 at 17:35
15  
-1 to whoever wrote that error message. Yuck. (if they only added a filename one could try apt-file search). – Rmano Apr 18 '14 at 18:29
    
@Rmano they did, I found it just fine using apt-file search. the full filename is com.canonical.unity.webapps.gschema.xml; maybe you need to run sudo apt-file update? – mchid Jul 28 '15 at 10:14
up vote 78 down vote accepted

Install the package unity-webapps-service

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2  
I have the same problem but can't install the package. I get this error message: The following packages have unmet dependencies. unity-webapps-service : Depends: webapp-container – Mrokii Feb 24 '15 at 10:12
3  
sudo apt-get install unity-webapps-service IS proper command – Pratik C Joshi Apr 4 '15 at 5:47
2  
I dont want webapps in my Desktop PC... Why can I not use a tweak tool without having a completely useless Ubuntu browser – Kaspar May 2 '15 at 17:52
2  
@Florian: Wow! For me that pulled 120MB of qt dependencies. – ccpizza Sep 28 '15 at 17:38
6  
Does this mean that the package for Unity Tweak Tool should have this package as a dependency but doesn't? – andrybak Oct 12 '15 at 21:28
up vote 17 down vote

Just a command line way to do jackyzy823's answer:

mkdir tweak;cd tweak
sudo apt-get download unity-webapps-service
ar xvf *
tar xvf data*
sudo mv usr/share/glib-2.0/schemas/com.canonical.unity.webapps.gschema.xml /usr/share/glib-2.0/schemas/
sudo glib-compile-schemas /usr/share/glib-2.0/schemas/
cd ..; sudo rm -Rf tweak
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4  
Beautiful! Works like a charm if you can't get the webapps-service to install. Thanks. – Andrew Fielden Oct 28 '15 at 10:23
2  
Thanks, I have upvoted both answers. Just a suggestion, though: you might want to specify which answer you mean by 'above' - in this case jackyzy823's answer. – Hitechcomputergeek Nov 8 '15 at 2:24
1  
In my case I didn't install anything. My theme and custom icon pack randomly stopped working and returned to default. Trying to re-configure it with Unity Tweak Tool failed with the same error as the OP. This answer fixed it. – Nahuel May 9 '16 at 19:10
    
In my case, I was getting this error because I actually do not have the notify-osd package installed; I am using xfce4-notifyd instead. So my fix was exactly as @mchid explained, only I downloaded notify-osd instead of unity-webapps-service. Works like a charm. – Jonathan Landrum Feb 28 at 20:57
up vote 13 down vote

A tricky way for this,because i do not want to download so many dependencies for unity-webapps-service.

extract the file com.canonical.unity.webapps.gschema.xml (you can see it in http://packages.ubuntu.com/trusty/amd64/unity-webapps-service/filelist) in package unity-webapps-service,put this file to /usr/share/glib-2.0/schemas/ and finally sudo glib-compile-schemas /usr/share/glib-2.0/schemas/ and it works.

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1  
Thanks! This is the best answer, as unity-webapps-service refuses to be installed. – Sumit Jain Jul 13 '15 at 6:19
    
Where do I find the schema file? – thesdog Sep 1 '15 at 21:55
    
@thesdog go here packages.ubuntu.com/trusty/unity-webapps-service. Download the deb package, and unpack using the instructions in the post below by mchid. – Andrew Fielden Oct 28 '15 at 10:18
up vote 9 down vote

Simple solution.

Just Install necessary packages.

sudo apt-get install unity-webapps-common
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1  
Installing this package solves the problem. At least for 14.10. – Grzegorz Żur Feb 4 '15 at 12:46
1  
I get this error: The following packages have unmet dependencies: unity-webapps-common : Depends: unity-webapps-service (>= 2.3.8-0ubuntu3) but it is not going to be installed E: Unable to correct problems, you have held broken packages. Synaptic says I have no broken packages. – Marc May 4 '15 at 1:13
    
how did you know to install unity-webapps-common ? It's not mentioned at all in the error screen shown in OP. Is it mystic knowledge that comes to you when you sleep? – frumbert May 7 '15 at 10:23
up vote 2 down vote

For those who still need a solution: the problem occurs if one uninstalls the overlay scrollbars. To solve the problem install the overlay scroll bars again (sudo apt-get install overlay-scrollbar) and disable them via the Unity Tweak Tool itself. (System->Scrolling)

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up vote 1 down vote

Simple, and effective type

sudo apt-get install unity-webapps-common unity-webapps-service

into the terminal

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yes..dear, that answer in already given above. Installing unity-webapps-service is enough. – Muddassir Nazir Apr 25 '15 at 14:56
up vote 1 down vote

I had no problem installing webapps service and webapps common. My exact problem was the package 

 com.canonical.unity.FileLens

was missing. I misread the screenshot in this question, and spent more than half an hour trying to figure out why even though unity webapps service and webapps common are installed unity tweak tool is not working. Finally I found out the above package was missing instead of the one mentioned in the screenshot.

To solve this error, install the unity-lens-files package

sudo apt-get install unity-lens-files

That's it. Unity Tweak Tool is now working! (finally!)

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up vote -1 down vote

Installing unity webapps is impossible because the dependencies are broken due to incompatibility with ubuntu 15.04

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What is impossible? – Seth♦ Oct 4 '15 at 3:35
    
well, we were talking about Trusty. You are too late. I posted this in April last year. – Muddassir Nazir Oct 4 '15 at 18:09

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