bmegli

Setup github project so that after any change to master branch doxygen documentation is generated and pushed to gh-pages by Travis CI

1. Add clean gh-pages branch to your repository

git checkout --orphan gh-pages
git rm -rf .
echo "my gh-pages branch" > README.md
git add .
git commit -a -m "clean gh-pages branch"
git push origin gh-pages

bmegli

Tested with Ubuntu MATE 20.04 LTS Daily Build (21.03.2020)

1. Download image
2. Create bootable USB with Startup Disk Creator
3. Boot GPD Win2 with Del to enter BIOS
4. Navigate to Save & Exit and select your USB device
5. Install & Reboot
6. Clone and apply UMPC hardware configuration for Ubuntu

bmegli

Motivatation

• modern CMake is required for building a lot of new software
• CMake is dependency for many packages (e.g. ROS related)
• we don't want to remove CMake (which would remove packages that depend on it)
• we want safe procedure to update CMake that can be reversed easily

Current version in OS

Check current version

bmegli

Scripts

cat performance.sh 
#! /bin/bash
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

for file in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo "performance" > $file; done

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

bmegli

Unninstalling Packages

# vcpkg_target_triplet is envirnoment variable with triplet name
vcpkg remove package:%vcpkg_target_triplet% --recurse

Installing Packages

bmegli

Looks like some "time bomb" in Firefox

To workaround:

1. Open about:config
2. Search for https3
3. Disable network.http.http3.enabled
4. Restart Firefox

Now re-enable network.http.http3.enabled and restart. It should be still working.

bmegli

git tag -d <tagname>                  # delete the old tag locally
git push origin :refs/tags/<tagname>  # delete the old tag remotely
git tag <tagname> <commit>          # make a new tag locally
git push origin <tagname>             # push the new local tag to the remote 

Source

bmegli

Motivation

When:

• using newer compilers from Ubuntu test ppa (e.g. ppa:ubuntu-toolchain-r/test)
• ppa-purge later to revert the system to clean state

it is possible to get to dissastrous state where libgcc_s.so.1 is misssing.

In such state apt and other applications may not work and system will not boot.

bmegli

# e.g for gcc-6 and g++-6
export CC=/usr/bin/gcc-6
export CXX=/usr/bin/g++-6
cmake ..
make -j8

bmegli

cat record.sh

set -x
ffmpeg -video_size 1920x1080 -framerate 30 -f x11grab -draw_mouse 0 -i :1 -c:v libx264 -crf 0 -preset ultrafast ~/Videos/$1