Problem: laptop's speakers sound quality is much worse than in windows. How to address this issue in Ubuntu 18.04?
I often use Krunner to quickly access often used files. Lately I changed my storage partition mount point, from /storage/ to /mount/storage/, but Krunner didn't record the change. It stills provides me a link to the old location, making it useless.
How can I delete Krunner's history or cache?
I've succesfully installed a few flatpak apps from the flathub repo, on Kubuntu 18.04 64bits.
Only problem is that the apps that require browsing through local files use a nautilus-like browser instead of dolphin, which isn't great because my favorited folders don't appear on the side pane, and sometimes links to my ntfs partition (shared partition with Windows where all my personal files are) just don't work. I'm using Kubuntu.
So I've tried uninstalling gnome runtimes flatpak uninstall org.gnome.Platform//3.26 (along with 3.28) and installing kde runtimes instead with flatpak install flathub org.kde.Platform//5.9 and flatpak install flathub org.kde.Sdk//5.9 but that didn't resolve the problem.
Apparently the problem is not linked to the runtimes (truth is I don't even know what a runtime is... :-p ). Zotero was the app needing gnome runtimes as I found out later when Zotero wouldn't launch!
Here's a picture of the issue 
For instance 'Documents' folder is considered as a file, and I can't open it. (This happens on Zotero only. With LibreOffice they appear as folders but I don't have access to favorites)
I've been trying to install several extensions on my newly installed GRASS GIS 7.0 (installed following instructions here), amongst them "i.fusion.hpf". The extension doesn't seem to matter as the problem is the same for everyone of them. So when I run g.extension, and try to add an extension, I get the message
ERROR: Please install GRASS development package
On GRASS's website I read that this error meant I had to install the "grass-dev" package. I tried to do so but when I do it in the terminal, I get dependencies error messages... (in french, with translation right after)
~$ sudo apt install grass-dev
Reading package lists ... Done
Building the dependency tree
Reading status information ...
Some packages can not be installed. This can mean
that you asked for the impossible, or, if you use
the unstable distribution, that some packages have not yet
been created or did not come out of entering.
The following information will help you resolve the situation:
Following packages contain unsatisfied dependencies:
grass-dev: depends: libgdal-dev but won't be installed
depends: libpq-dev but won't be installed
E: impossible to fix problems, defective packages are in "keep as is" mode.
When I try to install the dependencies, I basically get the same answers refering to other dependencies. As I don't want' to be messing too much with those, I ask for your kind help :-)
[Edit] I tried Abel Tom's answer but this is what I get:
$ sudo apt installs libgdal-dev libpq-dev
Reading package lists ... Done
Building the dependency tree
Reading status information ...
Some packages can not be installed. This can mean
that you asked for the impossible, or, if you use
the unstable distribution, that some packages have not yet
been created or did not come out of entering.
The following information will help you resolve the situation:
The following packages of unmet dependencies:
libpq-dev: Depends: libpq5 (= 9.5.8-0ubuntu0.16.04.1) but 9.5.9-0ubuntu0.16.04 must be installed
E: Unable to fix problems, packages are in "keep as is" mode.
I tried sudo apt install libpq5 but it's already installed.... strange. And sudo apt install -f didn't work out as well....
I tried uninstalling and reinstalling GRASS GIS but nothing changed... except now QGIS is uninstalled (so I reinstalled it, seems to work fine). I tried changing ppa. I went from ppa:ubuntugis/ubuntugis-unstable to ppa:grass/grass-stable and then downgraded to GRASS 7.0. Problem was even worse as I couldn't even access the add-ons database! Now I'm back on 7.2.
Starting to think it's because the packages are in development, somehow? Could the developers be updating them and thus they are inaccessible? I don't really know how that works to be honest... Also on g.extension's manual/troubleshooting, it says:
Since extensions have to be compiled on Unix based systems (Linux, Mac OSX etc.) unless a Python extension is installed, a full compiler environment must be present on the user's computer.
Does that mean I can install some Python extension? I'm really not sure what this means.
Good day,
Nat Azodnem