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11 <title>&os; &release.current; Release Notes</title>
13 <corpauthor>The &os; Project</corpauthor>
15 <pubdate>$FreeBSD$</pubdate>
19 <holder role="mailto:doc@FreeBSD.org">The &os; Documentation Project</holder>
22 <legalnotice id="trademarks" role="trademarks">
32 <para>The release notes for &os; &release.current; contain a summary
33 of the changes made to the &os; base system on the
34 &release.branch; development line.
35 This document lists applicable security advisories that were issued since
36 the last release, as well as significant changes to the &os;
38 Some brief remarks on upgrading are also presented.</para>
43 <title>Introduction</title>
45 <para>This document contains the release notes for &os;
47 describes recently added, changed, or deleted features of &os;.
48 It also provides some notes on upgrading
49 from previous versions of &os;.</para>
51 <para>This distribution of &os; &release.current; is a
52 &release.type; distribution. It can be found at <ulink
53 url="&release.url;"></ulink> or any of its mirrors. More
54 information on obtaining this (or other) &release.type;
55 distributions of &os; can be found in the <ulink
56 url="&url.books.handbook;/mirrors.html"><quote>Obtaining
57 &os;</quote> appendix</ulink> to the <ulink
58 url="&url.books.handbook;/">&os;
59 Handbook</ulink>.</para>
61 <para>All users are encouraged to consult the release errata before
62 installing &os;. The errata document is updated with
63 <quote>late-breaking</quote> information discovered late in the
64 release cycle or after the release. Typically, it contains
65 information on known bugs, security advisories, and corrections to
66 documentation. An up-to-date copy of the errata for &os;
67 &release.current; can be found on the &os; Web site.</para>
72 <title>What's New</title>
74 <para>The changes since the previous release can be found at
75 <ulink url="http://www.FreeBSD.org/releases/9.1R/relnotes.html"></ulink>.</para>
79 <title>Upgrading from previous releases of &os;</title>
82 <title>Upgrading using freebsd-update(8) or a source-based
85 <para arch="amd64,i386">Beginning with &os; 6.2-RELEASE,
86 binary upgrades between RELEASE versions (and snapshots of the
87 various security branches) are supported using the
88 &man.freebsd-update.8; utility. The binary upgrade procedure will
89 update unmodified userland utilities, as well as a unmodified GENERIC kernel
90 distributed as a part of an official &os; release.
91 The &man.freebsd-update.8; utility requires that the host being
92 upgraded have Internet connectivity.</para>
94 <para>Source-based upgrades (those based on recompiling the &os;
95 base system from source code) from previous versions are
96 supported, according to the instructions in
97 <filename>/usr/src/UPDATING</filename>.</para>
99 <para>For more specific information about upgrading
100 instructions, see <ulink
101 url="http://www.FreeBSD.org/releases/9.1R/installation.html"></ulink>.</para>
104 <para>Upgrading &os; should, of course, only be attempted after
105 backing up <emphasis>all</emphasis> data and configuration
111 <title id="upgrade-pitfalls">User-visible incompatibilities</title>
113 <para>FreeBSD 9.0 and later have several incompatiblities in
114 system configuration which you might want to know before
115 upgrading your system. <emphasis>Please read this section and
117 url="http://www.freebsd.org/releases/9.0R/relnotes-detailed.html#UPGRADE">Upgrading Section in 9.0-RELEASE Release Notes</ulink> carefully before submitting a problem report
118 and/or posting a question to the FreeBSD mailing
119 lists.</emphasis></para>