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Fixes for Ruby on Rails on Ubuntu 20.04
After you upgrade from Ubuntu 18.04 you will notice something's awry
After upgrading to Ubuntu 20.04 you may have noticed a few errors in your Ruby on Rails application. They aren’t obvious. At first everything seems to be working fine. Your monit is reporting all services up but you’re unable to connect to console. When you try to run it it complains about the lack of libreadline7.
You try to install libreadline7 but it doesn’t exist:
sudo apt-get install libreadline7-dev
You have to get the deb package itself
wget http://mirrors.kernel.org/ubuntu/pool/main/r/readline/libreadline7_7.0-3_amd64.deb
and install it via dpkg
dpkg -i libreadline7_7.0-3_amd64.deb
Your node command has also disappeared which means that asset compilation will fail. To prevent this install nodejs via apt install nodejs.
If your application is relying on an older version of node you will have to install it via n.
apt install npm
npm install -g n
Then finally use n to install the desired node version.
n 8
This will install node 8.17.0 for example.
If your application relies on libssl1.0 you will notice it’s not possible to install via apt. First you have to add a ppa repository:
sudo apt-add-repository -y ppa:rael-gc/rvm
Then you can install it via apt
sudo apt install libssl1.0-dev
If you get an issue about a missing libffi.so.6 you can symlink the currently installed version 7 like so:
sudo ln -s /usr/lib/x86_64-linux-gnu/libffi.so.7.1.0 /usr/lib/x86_64-linux-gnu/libffi.so.6
Finally if your application relies on weak ciphers and cannot be upgraded at this time you may see this error
SSL_CTX_use_certificate: ca md too weak
in your logs.
In order to fix that modify /etc/ssl/openssl.cnf by prepending the following to the start:
openssl_conf = default_conf
and appending the following to the end of that file:
[ default_conf ]
ssl_conf = ssl_sect
[ssl_sect]
system_default = ssl_default_sect
[ssl_default_sect]
MinProtocol = TLSv1.2
CipherString = DEFAULT:@SECLEVEL=0
Finally restart your thin/puma/sidekiq/resque processes so they pick up the changes.
