Hello, Mykychak.
The error which kmashint reported some posts above and which you encountered as well, this issue is limited to the 32-bit edition of Ubuntu 18.04 Mate.
Actually, the same issue has been reported and discussed in this thread as well:
First software update after 18.04 32 bit install breaks Software Boutique
The issue is caused by a shared library, which Software Boutique makes use of.
At this point in time, it seems as if Ubuntu has not started deploying any bugfixed version of the affected shared library, yet.
But there is a workaround, which can be applied in order to make Software Boutique function properly again on Ubuntu 18.04 Mate 32-bit.
Please, cf. my post in the mentioned other thread
HTH,
Karl