On 08.06.2017 20:52, Steven Chamberlain wrote: > Some versions of Ubuntu (at least trusty, xenial) have the added > "feature" to keep older kernel versions when installing new ones. It > kind of makes sense to keep at least the previous one (in case of a > regression), but keeping every new patch-version is too much. From running Ubuntu in production: It's very helpful if you can rollback an update (be it security or general) you have just received at the boot screen. In stable Debian almost never bumps the ABI version and hence you don't have that option. At the same time Debian's ABI guarantees are weaker: I had to reboot many times to insert an on-disk in-tree kernel module into the running kernel just because the on-disk version was updated. So I think Ubuntu does this better[*]. Ubuntu has a way of pruning old kernel versions at least with Xenial and up (VersionedKernelPackages in /etc/apt/apt.conf.d/01autoremove). For Trusty (and Precise and Lucid) we wrote our own tooling to deal with this issue. Kind regards Philipp Kern [*] Ubuntu doesn't bump the ABI on *every* new version, just the ones changing the ABI. In reality this is still very frequently and hence you achieve a rollback mechanism through it.
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