Whether we are francophone or anglophone, we can see very clearly what linguistic insecurity means in our personal relations with our colleagues in the House of Commons. It is the same thing among public servants.
As you were saying, linguistic insecurity is a reluctance to express oneself in one's own language or one's second language, and, sometimes, a lack of comfort in doing so. That is why insecurity must always be reduced by firm action and firm language on the part of all elected officials, and certainly on the part of the government.