Gordian knot @make: gcc-multilib vs. gcc-arm-linux-gnueabihf

I’ve tried to make an image for a Zed-Board under Ubuntu 18.04 with Xilinx 2020.1 versions:
The flow , respectively parts of it seem to require
gcc-multilib and
but they are mutually exclusive: Installing one of them uninstalls the other.
I have searched at lot for a remedy but did not find any that worked.
So how can I solve this issue?

Forgot the actual error message:
make[1]: Entering directory ‘/home/datatel/Petalinux/dt7xxx_Zynq_Zed_Petalinux/PYNQ/sdbuild/build/gcc-mb’
[INFO ] Performing some trivial sanity checks
[WARN ] Number of open files 1024 may not be sufficient to build the toolchain; increasing to 2048
[INFO ] Build started 20210701.135827
[INFO ] Building environment variables
[ERROR] Missing: ‘arm-unknown-linux-gnueabihf-ar’ or ‘arm-unknown-linux-gnueabihf-ar’ or ‘ar’ : either needed!
[ERROR] >>
[ERROR] >> Build failed in step ‘(top-level)’
[ERROR] >>
[ERROR] >> Error happened in: CT_Abort[scripts/functions@487]
[ERROR] >> called from: main[scripts/]