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'))
guix/'>summary</a><a href='/guix/refs/?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>refs</a><a class='active' href='/guix/log/gnu/services/hurd.scm'>log</a><a href='/guix/tree/gnu/services/hurd.scm?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>tree</a><a href='/guix/commit/gnu/services/hurd.scm?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>commit</a><a href='/guix/diff/gnu/services/hurd.scm?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/hurd.scm'>
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<div class='path'>path: <a href='/guix/log/?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>root</a>/<a href='/guix/log/gnu?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>gnu</a>/<a href='/guix/log/gnu/services?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>services</a>/<a href='/guix/log/gnu/services/hurd.scm?id=0d0fcb6227267fa221011752d5a1b3ed51108947'>hurd.scm</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/gnu/services/hurd.scm?id=0d0fcb6227267fa221011752d5a1b3ed51108947&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-30 01:08:55 +0100'>2021-11-30</span></td><td><a href='/guix/commit/gnu/services/hurd.scm?id=892f1b7273d57b25940700877a02618fe826cc08'>services: Accept &lt;inferior-package&gt;s in lieu of &lt;package&gt;s.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/authentication.scm (fprintd-configuration)
(nslcd-configuration): Substitute file-like objects for package ones.
* gnu/services/cgit.scm (cgit-configuration, opaque-cgit-configuration):
Likewise.
* gnu/services/cups.scm (package-list?, cups-configuration): Likewise.
* gnu/services/dns.scm (verify-knot-configuration)
(ddclient-configuration): Likewise.
* gnu/services/docker.scm (docker-configuration): Likewise.
* gnu/services/file-sharing.scm (transmission-daemon-configuration): Likewise.
* gnu/services/getmail.scm (getmail-configuration): Likewise.
* gnu/services/mail.scm (dovecot-configuration)
(opaque-dovecot-configuration): Likewise.
* gnu/services/messaging.scm (prosody-configuration)
(opaque-prosody-configuration): Likewise.
* gnu/services/monitoring.scm (zabbix-server-configuration)
(zabbix-agent-configuration): Likewise.
* gnu/services/networking.scm (opendht-configuration): Likewise.
* gnu/services/pm.scm (tlp-configuration): Likewise.
* gnu/services/telephony.scm (jami-configuration): Likewise.
* gnu/services/virtualization.scm (libvirt-configuration)
(qemu-guest-agent-configuration): Likewise.
* gnu/services/vpn.scm (openvpn-client-configuration): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>