it appears to be removed everywhere
https://packages.ubuntu.com/search?searchon=contents&keywords=libcuda.so.1&mode=exactfilename&suite=hirsute&arch=any
# apt install libcuda1
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libcuda1 is a virtual package provided by:
libnvidia-compute-455 455.45.01-0ubuntu1
libnvidia-compute-450-server 450.80.02-0ubuntu3
libnvidia-compute-450 450.80.02-0ubuntu1
libnvidia-compute-440-server 440.95.01-0ubuntu2
libnvidia-compute-418-server 418.152.00-0ubuntu2
libnvidia-compute-390 390.138-0ubuntu2
You should explicitly select one to install.
E: Package 'libcuda1' has no installation candidate
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