[Samba] Upgrade old infrastructure running 4.3 (and 4.13)

[Lorenzo Milesi]

> I hope this helps you out.

Thank you very much for the detailed explaination!

I'm just wondering, what's the purpose of seizing fsmo roles and then do step upgrades of Samba? Once it's cut off, I can delete everything, install 4.14 straight and join it back as suggested here[1].

As per OS I need to remain on Ubuntu 18.04 as there's another application which doesn't support 20.04. So I was going to use LinuxSchools PPA [2].

What concerns me the most is the head note of the upgrade page, given I'm currently on 4.3:
You should only consider using this method if you are running a modern Samba installation (i.e. v4.7 release or later, with a minimum 2008R2 base schema). It is better to use this method for major Samba version upgrades (e.g. v4.10 to v4.11).
My schema is ok (47), but the version is not.

Two further notes:
1. dbcheck returns no error on 4.3, while on 4.13 shows:
root at landc:~# samba-tool dbcheck --cross-ncs
Checking 3534 objects
NOTE: old (due to rename or delete) DN string component for fromServer in object CN=5ba66c59-f19c-4b5d-b565-3ff8d03c6562,CN=NTDS Settings,CN=LANDC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=contoso,DC=lan - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=contoso,DC=lan
Not fixing old string component
NOTE: old (due to rename or delete) DN string component for fSMORoleOwner in object CN=Infrastructure,DC=DomainDnsZones,DC=contoso,DC=lan - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=contoso,DC=lan
Not fixing old string component
NOTE: old (due to rename or delete) DN string component for fSMORoleOwner in object CN=Infrastructure,DC=ForestDnsZones,DC=contoso,DC=lan - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=contoso,DC=lan
Not fixing old string component
Checked 3534 objects (0 errors)
2. transfering roles throws an error (as I wrote in the first email), is seizing them "safer"? :)

Thanks again

[1] https://wiki.samba.org/index.php/Upgrading_a_Samba_AD_DC
[2] https://launchpad.net/~linux-schools/+archive/ubuntu/samba-latest
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Lorenzo Milesi - lorenzo.milesi at yetopen.com 
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