Since latest Nautilus 3.26.4, most external thumbnailers are not working anymore under Ubuntu 18.04 or 18.10.
I realized the problem when my LibreOffice and MsOffice thumbnailers stopped to work.
Why ? Because, since few months, some Nautilus external thumbnailers vulnerabilities have come to light (gnome-exe-thumbnailer for example).
As a result, Gnome Shell team has decided to harden thumbnails generation when using external thumbnailers.
First hardening steps have come with Nautilus 3.26.4, where all external thumbnailers are not called directly but thru bwrap, the bubblewrap project sandboxing tool.
Default bwrap options used by Nautilus appear to work fine under Fedora, but fail badly under Ubuntu and Debian based distros. This short article explains how to reactivate Nautilus external thumbnails generation under Ubuntu Bionic 18.04 and Cosmic 18.10. You should get back thumbnails generation as they were working with previous versions of Nautilus.
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 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
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:
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
If you find that your board isn’t showing up in ports and you’re getting this error:
error: espcomm_open failed
error: espcomm_upload_mem failed
First install the Silicon Labs CP2102 USB to UART Bridge driver for your operating system.
Then follow the instructions here to add the ESP8266 board to the Arduino IDE. see this tutorial
Good news is blogetery.com is back online. If you recall, this blog was in the process of moving to blogetery when the site got taken down by an over-eager service provider who thought Open Source was the work of El Quaeda. It didn’t help matters that a magazine called Vision was publishing recipes about how to blow up the world with Ubuntu.