Stuck.
I thought I installed RVM on this fresh ubuntu 20.04 box using the same commands I used on my old 19.10 box:
(from https://github.com/rvm/ubuntu_rvm)
sudo apt-add-repository -y ppa:rael-gc/rvm
sudo apt update
sudo apt install rvm
rvm install ruby
sudo apt install ruby-bundler
echo 'source "/etc/profile.d/rvm.sh"' >> ~/.bashrc
source ~/.bashrc
rvm use 2.7.0
rvm gemset create FOO
rvm gemset use FOO
gem install jekyll
gem install bundler
bundle install
However, my gemsets and ruby installs seem to disappear each time I reboot now. (This was not a problem before.)
My current workaround:
When bundle exec jekyll serve
fails, I run these commands to get it working again:
rvm use --default 2.7.0
rvm gemset create FOO
rvm gemset use FOO
gem install jekyll
gem install bundler
bundle install
I thought I have read the relevant docs at rvm.io, but clearly I am missing something...