Migration to the Ubuntu

Good day.
Dear colleagues, we are working on the issue of server migration to the Ubuntu operating system, please clarify the following points:
1. Is it possible to migrate settings from existing RHEL environments (Network settings, disk settings, java settings, jdbc driver, system settings, user settings)?
2. Please specify the list of default packages for distributions.
3. How often do you release security patches and critical updates yourself? Is there a binding to public signature / vulnerability repositories?
4. Please specify the version and names of the infrastructure drivers (network, graphics, esxi).
5. What developer / administrator utilities are available in editions?
6. Is there java 1.7 support?
7. Which jdk, jre distributions are included in the OS and are they supported?
8. Is there support for Wildfly 16, Postgres Pro 11.4?
9. Please specify what compilers of programming languages ​​are?
10. Tell me, are there any problems with the work with the package manager (earlier such problems were observed on technical support)?
Have you conducted a comparative analysis of the functionality and performance of distributions such as Ubuntu with RedHat, CentOS, OpenSUSE, Debian, Astra Linux, Alt Linux? If yes, please send the results.
11. Is there any support for working with backup systems?