CSS code in ~/.config/gtk-3.0/gtk.css:

notebook tab {
    /* background-color: #222; */
    padding: 0.4em;
    border: 0;
    border-color: #444;
    border-style: solid;
    border-width: 1px;
}
 
notebook tab:checked {
    /* background-color: #000; */
    background-image: none;
    border-color: #76C802;
}
 
notebook tab:checked label {
    color: #76C802;
    font-weight: 500;
}
 
notebook tab button {
    padding: 0;
    background-color: transparent;
    color: #ccc;
}
 
notebook tab button:hover {
  border: 0;
  background-image: none;
  border-color: #444;
  border-style: solid;
  border-width: 1px;
}

~/.config/gtk-3.0/gtk.css (adjusting the width to your liking) and all will be fine:

.scrollbar.vertical slider, scrollbar.vertical slider {
        min-width: 10px;
}

button:active {
background-color: #0274d9;
}

button:hover {
background-color: #3085a9;
}

*:disabled {
background-color: #320a91;
}

checkbutton:checked {
background-color: #C71585;
}

label:focus {
background-color: #b4940f;
}

checkbutton:indeterminate {
background-color: #20395a;
}

Okay, its been a long while since I upgraded one of my partitions, running ubuntu 12:04, and so the need to get closer to 18:04 meant, I had to upgrade one step at a time, and you know the problem, nobody figured an easier way to skip past a decade of neglect.
Trouble is, I don’t want to upgrade too far, since its old hardware. And there lies the rub.
After experiencing a cups log inflation story from hell, see here.
I then ran into this problem, no working CUPS panel
solution
sudo apt remove --purge cups
apt autoremove
apt remove cups*
cd /etc/cups & rm *
cd /usr/share/cups & rm *
apt install cups
apt install lsb

service cups restart
check permissions
first check if the log is kicking up a fuss:
tail /var/log/cups/error_log
E [01/Apr/2019:17:07:50 +0200] [CGI] Directory \"/usr/lib/cups/backend\" has insecure permissions (040755/uid=1000/gid=1000)
which gives us an indication, to make certain
ls -al /usr/lib/cups/backend
then
sudo chmod 755 /usr/lib/cups/backend
sudo chown root:root /usr/lib/cups/backend
and if that fails, try this trick:
sudo cp /usr/share/cups/cupsd.conf.default /etc/cups/cupsd.conf
sudo service cups restart

This is by far the best method of managing multiple ISO on a USB
MultibootUSB
I used this tutorial to get the first ISO onto the stick, after which you can simply drop the ISOs into the multiobootusb folder.
Another method which I haven’t tried

Here is a step-by-step solution how to install the drivers for the Canon PIXMA iP3600 printer on Ubuntu 9.10 (should work for all printers as well with their respective drivers, and for later ubuntu releases as well)
The .deb packages from canon need to be modified to replace the dependency on libcupsys2 by libcups2
1) download Canon’s driver in .deb format from here:
http://software.canon-europe.com/software/0031336.asp and save it to your disk. The file will be ip3600_debian_printer.tar
2) Change to this directory, and untar the archive:
tar xvf ip3600_debian_printer.tar
It produces the following files:
cnijfilter-ip3600series_3.00-1_i386.deb
cnijfilter-common-3.00-1.tar.gz
cnijfilter-common_3.00-1_i386.deb
3) It is the two .deb files, which need modifications before installation. For both of them do the following (where X.deb stands
for the given .deb file, replace X by the filename)
ar x X.deb
# this produces debian-binary, data.tar.gz and control.tar.gz
# in the current working directory)
mkdir tmp; cd tmp
# create and change to the tmp directory
tar xvzf ../control.tar.gz
# this extracts the following files into tmp/: md5sums, control
# (and postinst and postrm in case of cnijfilter-ip3600series_3.00-1_i386.deb)
sed -i ‘s/libcupsys2/libcups2/g’ control
# this replaces libcupsys2 by libcups2 in the file ‘control’
rm -f ../control.tar.gz
# remove the old archive
tar cvzf ../control.tar.gz *
# this re-creates the control.tar.gz archive with all the files
cd ..; rm -rf tmp
# change one directory up, remove tmp/ directory
ar r X.deb control.tar.gz
# this replaces the control.tar.gz member in the X.deb debian
# package file (which is a standard Unix ‘ar’ archive)
rm -f control.tar.gz debian-binary data.tar.gz
# this cleans up temporary files
4) Ready. Install these two packages:
sudo dpkg -i *.deb
Good luck!

Our new address: http://u8untu.blogetery.com