Where is the output from startup scripts stored in Ubuntu 19.10?

By removing the parameters quiet and splash from GRUB_CMDLINE_LINUX_DEFAULT line at the /etc/default/grub file, I am able to display the messages displayed by system startup scripts (services) to the screen during Ubuntu boot. However, these messages are scrolling very fast and it is practically impossible to catch any FAILED messages. The file /var/log/boot.log used to…

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