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Fix unbound variable
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@ -99,7 +99,7 @@ hide_output add-apt-repository -y ppa:certbot/certbot
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# of things from Ubuntu, as well as the directory of packages provide by the
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# PPAs so we can install those packages later.
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if [ "$SKIP_SYSTEM_UPDATE" != "1" ]; then
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if [ "${SKIP_SYSTEM_UPDATE:-0}" != "1" ]; then
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echo Updating system packages...
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hide_output apt-get update
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apt_get_quiet upgrade
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