MX23.6 KDE x64 won't update CPP-12 [Solved]

[dolphin_oracle]

this looks like maybe the deb didnt' download all the way, or some other source for file corruption. I don't think this is a dependency issue or anything like that.

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pkg-deb (subprocess): decompressing archive '/var/cache/apt/archives/cpp-12_12.2.0-14+deb12u1_amd64.deb' (size=9767788) member 'data.tar': lzma error: compressed data is corrupt
dpkg-deb: error: <decompress> subprocess returned error exit status 2
dpkg: error processing archive /var/cache/apt/archives/cpp-12_12.2.0-14+deb12u1_amd64.deb (--unpack):
cannot copy extracted data for './usr/lib/gcc/x86_64-linux-gnu/12/cc1' to '/usr/lib/gcc/x86_64-linux-gnu/12/cc1.dpkg-new': unexpected end of file or stream

this is a tricky one. the main issue is that lots of things require cpp-12 to be installed, so apt purge isn't really an option.

try forcing it to download the deb again with

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sudo apt install --reinstall cpp-12

and post any output.

[timkb4cq]

This is the relevant part

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dpkg-deb (subprocess): decompressing archive '/var/cache/apt/archives/cpp-12_12.2.0-14+deb12u1_amd64.deb' (size=9767788) member 'data.tar': lzma error: compressed data is corrupt

The cached copy of that deb file on your drive is corrupt. You need to delete it

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sudo rm /var/cache/apt/archives/cpp-12_12.2.0-14+deb12u1_amd64.deb

so a new copy will be downloaded when you install it again.

[gafferb]

Followed timkb4cq advice and deleted the cache copy.
Then followed dolphin_oracle to reinstall cpp-12 and SUCCESS.
All updated without errors showing.
Many thanks for everyone's patience.

gafferb