I managed to go around the issue by extracting libtsan_preinit.o from libgcc-10-dev and manually installing it to /usr/lib/gcc/x86_64-linux-gnu/9/libtsan_preinit.o.
In a temporary directory:
apt-get download libgcc-10-dev
dpkg -x "libgcc-10-dev_10.5.0-1ubuntu1~20.04_amd64.deb" .
sudo cp usr/lib/gcc/x86_64-linux-gnu/10/libtsan_preinit.o /usr/lib/gcc/x86_64-linux-gnu/9/
I managed to go around the issue by extracting libtsan_preinit.o from libgcc-10-dev and manually installing it to /usr/lib/ gcc/x86_ 64-linux- gnu/9/libtsan_ preinit. o.
In a temporary directory: 10-dev_ 10.5.0- 1ubuntu1~ 20.04_amd64. deb" . gcc/x86_ 64-linux- gnu/10/ libtsan_ preinit. o /usr/lib/ gcc/x86_ 64-linux- gnu/9/
apt-get download libgcc-10-dev
dpkg -x "libgcc-
sudo cp usr/lib/