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For libsodium you can find the appropriate package (v1.0.16-0) files files here:
https://launchpad.net/ubuntu/+source/libsodium
https://launchpad.net/~phoerious/+archive/ubuntu/keepassxc/+sourcepub/8814980/+listing-archive-extra
For libnss you can find the appropriate package (v3.35) files files here:
https://packages.ubuntu.com/bionic/libnss3
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