I am making a new raspberry+jessie +yunohost 2.4 machine in order to migrate from my old rapsberry+wheezy+yunohost2.2
I saw this page to copy all the mails for users: https://yunohost.org/#/email_migration_fr
'I’m running on Ubuntu 16.04
SO I install ruby and gem and then
sudo gem install larch Building native extensions. This could take a while... ERROR: Error installing larch: ERROR: Failed to build gem native extension. current directory: /var/lib/gems/2.3.0/gems/sqlite3-1.3.12/ext/sqlite3 /usr/bin/ruby2.3 -r ./siteconf20161211-357-1h2ii94.rb extconf.rb mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h extconf failed, exit code 1 Gem files will remain installed in /var/lib/gems/2.3.0/gems/sqlite3-1.3.12 for inspection. Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/sqlite3-1.3.12/gem_make.out
could you help please?