https://bugzilla.suse.com/show_bug.cgi?id=1228415 https://bugzilla.suse.com/show_bug.cgi?id=1228415#c9 --- Comment #9 from Michael Andres <ma@suse.com> --- (In reply to Paul Fee from comment #8)

Should the same approach be used when upgrading across distro versions? If starting from 15.4, should one upgrade to the 15.5 version of zypper before upgrading the rest of the packages?

Within the SLE15 family the zypp stack is not branched, i.e. we distribute the same zypp version to all SPs until they reach their EOL (same for Leap). If you don't wait far longer than the EOL of the old SP, the zypp version in both SPs are (nearly) the same. So it's usually safe to fully update the old SP and use the 'old' zypper to drive the dup. More important here is that all old repos are disabled and all the new repos enabled when doing the dup. So you don't get a mixed system. Big steps - as from SLE12 to SLE15 - are different. Here you can not be sure that the SLE12 update stack fully understands and supports SLE15 systems and repos. Here you want the new stack to drive the dup. That's why this is often done offline, because bringing the SLE15 zypp stack into a SLE12 system may be difficult. -- You are receiving this mail because: You are on the CC list for the bug.