<div dir="ltr">Thank you, Shlomi. I like the difference between theory and practice.<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="direction:rtl"><div style="direction:rtl">אורי</div><div style="direction:rtl"><a href="mailto:uri@speedy.net" target="_blank">uri@speedy.net</a></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 10, 2020 at 6:19 PM Shlomi Fish <<a href="mailto:shlomif@gmail.com">shlomif@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi Uri!<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 10, 2020 at 5:30 PM אורי <<a href="mailto:uri@speedy.net" target="_blank">uri@speedy.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>I'm sorry for posting twice in the same day to the same mailing list. But I have a question: I'm using Ubuntu 18.04.3 LTS for a few production servers (one of them I upgraded a few months ago from 14.04). How important it is to upgrade the OS version, or can I keep it like this? I'm afraid that things will break up if I upgrade. And if I upgrade, should I upgrade to Ubuntu 18.04.4 or 20.04? I think since 20.04 has been recently released, it might have bugs which will be fixed later, and I prefer not to use the first version of 20.04 but to wait about one year before I use it. Is there a risk with keeping using 18.04.3? Or should I upgrade at least to 18.04.4?</div><div><br></div></div></blockquote><div><br></div><div>I've answered the general question here:</div><div><br></div><div><a href="https://github.com/shlomif/Freenode-programming-channel-FAQ/blob/master/FAQ_with_ToC__generated.md#will-a-change-i-would-like-to-do-break-some-functionality" target="_blank">https://github.com/shlomif/Freenode-programming-channel-FAQ/blob/master/FAQ_with_ToC__generated.md#will-a-change-i-would-like-to-do-break-some-functionality</a></div><div><br></div><div>Quoting it:</div><div><br></div><div><h3>Will a change I would like to do break some functionality?</h3>
<p>As the <a href="https://github.com/shlomif/shlomif-email-signature/blob/master/shlomif-sig-quotes.txt#L1988" target="_blank">aphorism</a>
goes: <q>The difference between theory and practice is that in theory, there
is no difference between theory and practice, while in practice, there is.</q>. There is usually
a risk, however small, that a change will break some functionality. With good tooling (such
as <a href="https://en.wikipedia.org/wiki/Version_control" rel="nofollow" target="_blank">https://en.wikipedia.org/wiki/Version_control</a> , <a href="https://en.wikipedia.org/wiki/Virtual_machine" rel="nofollow" target="_blank">https://en.wikipedia.org/wiki/Virtual_machine</a> and
<a href="https://en.wikipedia.org/wiki/OS-level_virtualisation" rel="nofollow" target="_blank">https://en.wikipedia.org/wiki/OS-level_virtualisation</a> ) it should be relatively easy to
revert a change which introduced regressions, and you should do adequate testing.</p>
<p>A change may have to be avoided due to being estimated as too time or money
consuming, or as having too little gain. However, promising changes
should be attempted because:</p>
<ol><li>"No guts - no glory."</li><li><a href="https://szabgab.com/what-does--if-it-aint-broke-dont-fix-it--really-mean.html" rel="nofollow" target="_blank">What does "if it ain't broke, don't fix it" really mean?</a></li><li>If you never change anything, your project won't progress.</li></ol>
<h3>----------</h3><div>While you may break some functionality by updating to 18.04.04 , you also risk being affected by known security vulnerabilities (which may also break functionality sooner or later). There is a concept of <a href="https://en.wikipedia.org/wiki/Technical_debt" target="_blank">https://en.wikipedia.org/wiki/Technical_debt</a> .</div><div><br></div><div>Regarding updating to 20.04, it is likely more time consuming and may have more breaking changes, and you may not need all the newest and shiniest software versions there, and you may wish to only update to ubuntu 22.04/etc. I didn't hear of too many horror stories of ubuntu 20.04 being unusable or unstable, but I'm quite out of the loop.</div><div><br></div><div>Good luck!</div><div><br></div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div></div><div>Thanks,</div><div>Uri.<br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div style="direction:rtl"><div style="direction:rtl">אורי</div><div style="direction:rtl"><a href="mailto:uri@speedy.net" target="_blank">uri@speedy.net</a></div></div></div></div></div></div></div></div></div>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Shlomi Fish <a href="https://www.shlomifish.org/" target="_blank">https://www.shlomifish.org/</a><br><br>Buddha has the Chuck Norris nature.</div><div dir="ltr"><br></div><div dir="ltr">Please reply to list if it's a mailing list post - <a href="http://shlom.in/reply" target="_blank">http://shlom.in/reply</a> .<br></div></div></div></div></div></div></div></div></div>
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