Taken from debian.

# Description: Disable update check by default.
Index: calibre/src/calibre/gui2/main.py
===================================================================
--- calibre.orig/src/calibre/gui2/main.py	2014-02-02 10:41:28.470954623 +0100
+++ calibre/src/calibre/gui2/main.py	2014-02-02 10:41:56.546954247 +0100
@@ -37,8 +37,8 @@
                       help=_('Start minimized to system tray.'))
     parser.add_option('-v', '--verbose', default=0, action='count',
                       help=_('Ignored, do not use. Present only for legacy reasons'))
-    parser.add_option('--no-update-check', default=False, action='store_true',
-            help=_('Do not check for updates'))
+    parser.add_option('--update-check', dest='no_update_check', default=True, action='store_false',
+            help=_('Check for updates'))
     parser.add_option('--ignore-plugins', default=False, action='store_true',
             help=_('Ignore custom plugins, useful if you installed a plugin'
                 ' that is preventing calibre from starting'))
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<div class='path'>path: <a href='/guix/log/?id=8c0751505be23640c6a789e10c9be3982be16d80'>root</a>/<a href='/guix/log/etc?id=8c0751505be23640c6a789e10c9be3982be16d80'>etc</a>/<a href='/guix/log/etc/guix-publish.service.in?id=8c0751505be23640c6a789e10c9be3982be16d80'>guix-publish.service.in</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/guix-publish.service.in?id=8c0751505be23640c6a789e10c9be3982be16d80&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-06-05 17:27:22 +0200'>2019-06-05</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=a5ca4a63426f5e24c13b93bde95511e9d89757f5'>etc: Fix GUIX_LOCPATH quoting in 'guix-publish.service' file.</a><span class='msg-avail'>...</span></td><td>Jack Hill</td></tr>
<tr><td><span title='2019-05-13 23:46:08 +0200'>2019-05-13</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=489d6c0dc03f1d95a3fefa6301f36cac9b50b2c3'>Set 'LC_ALL=en_US.utf8' in systemd '.service' files.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-23 15:42:01 +0100'>2018-11-23</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=e9926f80c6553fde50ce1fcfd38d6370f841efd2'>build: Binary tarball now populates the "current-guix" profile.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-06 13:25:51 -0500'>2017-03-06</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=613d0895b92c677e0639d5e77c55043e38e020c8'>build: Don't embed absolute paths in .service and .conf service files.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-11-24 09:23:11 +0100'>2016-11-24</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=332d7903f52c2bf3741b04ac2d01cd9018b70800'>Add system start-up files for "guix publish".</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>