Package: synaptic
Version: 0.84.6
I set /var/cache/apt/archives to tmpfs. For this reason, this folder is
empty after reload. Now, if I try install some package via Synaptic,
Synaptic try download package to /var/cache/apt/archives/partial, can't
find this folder and show error. And yes, apt install package-name still
work pretty well. Well, just add mkdir to Synaptic and this bug can be
closed.
PS https://bugs.launchpad.net/ubuntu/+source/synaptic/+bug/1591620 - in
Ubuntu this bug present from 2016 year.