For a finite vector space $V$ and a non-negative integer $r\le\dim V$ we
estimate the smallest possible size of a subset of $V$, containing a translate
of every $r$-dimensional subspace. In particular, we show that if $K\subset V$
is the smallest subset with this property, $n$ denotes the dimension of $V$,
and $q$ is the size of the underlying field, then for $r$ bounded and $r<n\le
rq^{r-1}$ we have $|V\setminus K|=\Theta(nq^{n-r+1})$. This improves previously
known bounds $|V\setminus K|=\Omega(q^{n-r+1})$ and $|V\setminus
K|=O(n^2q^{n-r+1})$.