Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID▼ Status▲ Resolution Sev Product Comp Assignee Reporter Summary
48060 NEW --- nor Sisyphus tcb-util ldv Igor.A.Molchanov Невозможно создать пользователя через useradd из-за tcb после tcb_convert

File a new bug in the "tcb-utils" component of the "Sisyphus" product