Comment 3 for bug 1895632

Builds of glibc and cross-toolchain-base-ports are in groovy proposed.
Therefore in proposed (where things build) one can already again install the dependencies:

# apt install gcc-alpha-linux-gnu
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libnvpair1linux libuutil1linux libzfs2linux libzpool2linux
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  binutils binutils-alpha-linux-gnu binutils-common binutils-x86-64-linux-gnu cpp-10-alpha-linux-gnu cpp-alpha-linux-gnu gcc-10-alpha-linux-gnu gcc-10-alpha-linux-gnu-base
  gcc-10-cross-base-ports libatomic1-alpha-cross libbinutils libc6.1-alpha-cross libc6.1-dev-alpha-cross libctf0 libgcc-10-dev-alpha-cross libgcc-s1-alpha-cross libgomp1-alpha-cross
  libitm1-alpha-cross linux-libc-dev-alpha-cross
Suggested packages:
  binutils-doc gcc-10-locales cpp-doc gcc-10-doc autoconf automake libtool flex bison gdb-alpha-linux-gnu gcc-doc
The following NEW packages will be installed:
  binutils-alpha-linux-gnu cpp-10-alpha-linux-gnu cpp-alpha-linux-gnu gcc-10-alpha-linux-gnu gcc-10-alpha-linux-gnu-base gcc-10-cross-base-ports gcc-alpha-linux-gnu libatomic1-alpha-cross
  libc6.1-alpha-cross libc6.1-dev-alpha-cross libgcc-10-dev-alpha-cross libgcc-s1-alpha-cross libgomp1-alpha-cross libitm1-alpha-cross linux-libc-dev-alpha-cross
The following packages will be upgraded:
  binutils binutils-common binutils-x86-64-linux-gnu libbinutils libctf0
5 upgraded, 15 newly installed, 0 to remove and 121 not upgraded.
Need to get 27.4 MB of archives.
After this operation, 71.1 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://archive.ubuntu.com/ubuntu groovy/main amd64 libctf0 amd64 2.35-3ubuntu1 [47.4 kB]
Get:2 http://archive.ubuntu.com/ubuntu groovy/main amd64 binutils-x86-64-linux-gnu amd64 2.35-3ubuntu1 [1644 kB]
Get:3 http://archive.ubuntu.com/ubuntu groovy/main amd64 libbinutils amd64 2.35-3ubuntu1 [481 kB]
Get:4 http://archive.ubuntu.com/ubuntu groovy/main amd64 binutils amd64 2.35-3ubuntu1 [3376 B]
Get:5 http://archive.ubuntu.com/ubuntu groovy/main amd64 binutils-common amd64 2.35-3ubuntu1 [212 kB]
Get:6 http://archive.ubuntu.com/ubuntu groovy/universe amd64 gcc-10-alpha-linux-gnu-base amd64 10.2.0-3ubuntu1cross1 [20.3 kB]
Get:7 http://archive.ubuntu.com/ubuntu groovy/universe amd64 cpp-10-alpha-linux-gnu amd64 10.2.0-3ubuntu1cross1 [6359 kB]
Get:8 http://archive.ubuntu.com/ubuntu groovy/universe amd64 cpp-alpha-linux-gnu amd64 4:10.1.0-1ubuntu1 [6136 B]
Get:9 http://archive.ubuntu.com/ubuntu groovy/universe amd64 binutils-alpha-linux-gnu amd64 2.35-3ubuntu1 [1129 kB]
Get:10 http://archive.ubuntu.com/ubuntu groovy/universe amd64 gcc-10-cross-base-ports all 10.2.0-3ubuntu1cross1 [15.4 kB]
Get:11 http://archive.ubuntu.com/ubuntu groovy-proposed/universe amd64 libc6.1-alpha-cross all 2.32-0ubuntu3cross2 [1189 kB]
Get:12 http://archive.ubuntu.com/ubuntu groovy/universe amd64 libgcc-s1-alpha-cross all 10.2.0-3ubuntu1cross1 [30.2 kB]
Get:13 http://archive.ubuntu.com/ubuntu groovy/universe amd64 libgomp1-alpha-cross all 10.2.0-3ubuntu1cross1 [99.5 kB]
Get:14 http://archive.ubuntu.com/ubuntu groovy/universe amd64 libitm1-alpha-cross all 10.2.0-3ubuntu1cross1 [27.0 kB]
Get:15 http://archive.ubuntu.com/ubuntu groovy/universe amd64 libatomic1-alpha-cross all 10.2.0-3ubuntu1cross1 [8356 B]
Get:16 http://archive.ubuntu.com/ubuntu groovy/universe amd64 libgcc-10-dev-alpha-cross all 10.2.0-3ubuntu1cross1 [265 kB]
Get:17 http://archive.ubuntu.com/ubuntu groovy/universe amd64 gcc-10-alpha-linux-gnu amd64 10.2.0-3ubuntu1cross1 [12.8 MB]
Get:18 http://archive.ubuntu.com/ubuntu groovy/universe amd64 gcc-alpha-linux-gnu amd64 4:10.1.0-1ubuntu1 [1412 B]
Get:19 http://archive.ubuntu.com/ubuntu groovy-proposed/universe amd64 linux-libc-dev-alpha-cross all 5.8.0-19.20cross2 [1092 kB]
Get:20 http://archive.ubuntu.com/ubuntu groovy-proposed/universe amd64 libc6.1-dev-alpha-cross all 2.32-0ubuntu3cross2 [1971 kB]
Fetched 27.4 MB in 4s (6587 kB/s)
(Reading database ... 57783 files and directories currently installed.)
Preparing to unpack .../00-libctf0_2.35-3ubuntu1_amd64.deb ...
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Setting up linux-libc-dev-alpha-cross (5.8.0-19.20cross2) ...
Setting up binutils-common:amd64 (2.35-3ubuntu1) ...
Setting up binutils-alpha-linux-gnu (2.35-3ubuntu1) ...
Setting up libc6.1-alpha-cross (2.32-0ubuntu3cross2) ...
Setting up libgcc-s1-alpha-cross (10.2.0-3ubuntu1cross1) ...
Setting up libatomic1-alpha-cross (10.2.0-3ubuntu1cross1) ...
Setting up libgomp1-alpha-cross (10.2.0-3ubuntu1cross1) ...
Setting up gcc-10-alpha-linux-gnu-base:amd64 (10.2.0-3ubuntu1cross1) ...
Setting up libbinutils:amd64 (2.35-3ubuntu1) ...
Setting up libctf0:amd64 (2.35-3ubuntu1) ...
Setting up libc6.1-dev-alpha-cross (2.32-0ubuntu3cross2) ...
Setting up libitm1-alpha-cross (10.2.0-3ubuntu1cross1) ...
Setting up cpp-10-alpha-linux-gnu (10.2.0-3ubuntu1cross1) ...
Setting up cpp-alpha-linux-gnu (4:10.1.0-1ubuntu1) ...
Setting up binutils-x86-64-linux-gnu (2.35-3ubuntu1) ...
Setting up libgcc-10-dev-alpha-cross (10.2.0-3ubuntu1cross1) ...
Setting up binutils (2.35-3ubuntu1) ...
Setting up gcc-10-alpha-linux-gnu (10.2.0-3ubuntu1cross1) ...
Setting up gcc-alpha-linux-gnu (4:10.1.0-1ubuntu1) ...
Processing triggers for libc-bin (2.31-0ubuntu11) ...
Processing triggers for man-db (2.9.3-2) ...

Is that enough to kick plenty of retries or do you want to wait for something before doing so?