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<p>I've seen the same thing on a system running stretch, there is no
encryption. It is an LVM setup with root and var in logical
volumes.</p>
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<p>Very early in the boot, after about 6 or 7 other lines appear in
the console, I see</p>
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<pre class="message" style="font-family: monospace; padding-top: 8px; margin-top: 0px; border-top: 0px; color: rgb(0, 0, 0); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;">WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
Reading the lvmetad man page, it suggested that it may be necessary to run 'pvscan --cache' to initialize the cache. I tried that and then rebooted, the same warning still appears.
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