Error: Is a directory @ io_fillbuf /usr/local/lib

[researcher2312]

Output of brew config

HOMEBREW_VERSION: 4.4.6
ORIGIN: https://github.com/Homebrew/brew
HEAD: cc0b5d6d05d1f3af5b2f53e9fbb1e7bfa0c332ab
Last commit: 4 days ago
Core tap JSON: 21 Nov 11:12 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :0
HOMEBREW_EDITOR: hx
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 3.3.4 => /usr/bin/ruby3.3
CPU: quad-core 64-bit skylake
Clang: N/A
Git: 2.45.2 => /bin/git
Curl: 8.9.1 => /bin/curl
Kernel: Linux 6.11.0-8-generic x86_64 GNU/Linux
OS: Ubuntu 24.10 (oracular)
Host glibc: 2.40
/usr/bin/gcc: 14.2.0
/usr/bin/ruby: 3.3.4
glibc: N/A
gcc@11: N/A
gcc: N/A
xorg: N/A

Output of brew doctor:

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected header files:
  /usr/local/include/dbcppp/Attribute.h
  /usr/local/include/dbcppp/AttributeDefinition.h
  /usr/local/include/dbcppp/BitTiming.h
  /usr/local/include/dbcppp/CApi.h
  /usr/local/include/dbcppp/EnvironmentVariable.h
  /usr/local/include/dbcppp/Export.h
  /usr/local/include/dbcppp/Iterator.h
  /usr/local/include/dbcppp/Message.h
  /usr/local/include/dbcppp/Network.h
  /usr/local/include/dbcppp/Network2Functions.h
  /usr/local/include/dbcppp/Node.h
  /usr/local/include/dbcppp/Signal.h
  /usr/local/include/dbcppp/SignalGroup.h
  /usr/local/include/dbcppp/SignalMultiplexerValue.h
  /usr/local/include/dbcppp/SignalType.h
  /usr/local/include/dbcppp/ValueEncodingDescription.h
  /usr/local/include/dbcppp/ValueTable.h
  /usr/local/include/google/protobuf/runtime_version.h
  /usr/local/include/spdlog/async.h
  /usr/local/include/spdlog/async_logger-inl.h
  /usr/local/include/spdlog/async_logger.h
  /usr/local/include/spdlog/cfg/argv.h
  /usr/local/include/spdlog/cfg/env.h
  /usr/local/include/spdlog/cfg/helpers-inl.h
  /usr/local/include/spdlog/cfg/helpers.h
  /usr/local/include/spdlog/common-inl.h
  /usr/local/include/spdlog/common.h
  /usr/local/include/spdlog/details/backtracer-inl.h
  /usr/local/include/spdlog/details/backtracer.h
  /usr/local/include/spdlog/details/circular_q.h
  /usr/local/include/spdlog/details/console_globals.h
  /usr/local/include/spdlog/details/file_helper-inl.h
  /usr/local/include/spdlog/details/file_helper.h
  /usr/local/include/spdlog/details/fmt_helper.h
  /usr/local/include/spdlog/details/log_msg-inl.h
  /usr/local/include/spdlog/details/log_msg.h
  /usr/local/include/spdlog/details/log_msg_buffer-inl.h
  /usr/local/include/spdlog/details/log_msg_buffer.h
  /usr/local/include/spdlog/details/mpmc_blocking_q.h
  /usr/local/include/spdlog/details/null_mutex.h
  /usr/local/include/spdlog/details/os-inl.h
  /usr/local/include/spdlog/details/os.h
  /usr/local/include/spdlog/details/periodic_worker-inl.h
  /usr/local/include/spdlog/details/periodic_worker.h
  /usr/local/include/spdlog/details/registry-inl.h
  /usr/local/include/spdlog/details/registry.h
  /usr/local/include/spdlog/details/synchronous_factory.h
  /usr/local/include/spdlog/details/tcp_client-windows.h
  /usr/local/include/spdlog/details/tcp_client.h
  /usr/local/include/spdlog/details/thread_pool-inl.h
  /usr/local/include/spdlog/details/thread_pool.h
  /usr/local/include/spdlog/details/udp_client-windows.h
  /usr/local/include/spdlog/details/udp_client.h
  /usr/local/include/spdlog/details/windows_include.h
  /usr/local/include/spdlog/fmt/bin_to_hex.h
  /usr/local/include/spdlog/fmt/bundled/args.h
  /usr/local/include/spdlog/fmt/bundled/chrono.h
  /usr/local/include/spdlog/fmt/bundled/color.h
  /usr/local/include/spdlog/fmt/bundled/compile.h
  /usr/local/include/spdlog/fmt/bundled/core.h
  /usr/local/include/spdlog/fmt/bundled/format-inl.h
  /usr/local/include/spdlog/fmt/bundled/format.h
  /usr/local/include/spdlog/fmt/bundled/locale.h
  /usr/local/include/spdlog/fmt/bundled/os.h
  /usr/local/include/spdlog/fmt/bundled/ostream.h
  /usr/local/include/spdlog/fmt/bundled/printf.h
  /usr/local/include/spdlog/fmt/bundled/ranges.h
  /usr/local/include/spdlog/fmt/bundled/std.h
  /usr/local/include/spdlog/fmt/bundled/xchar.h
  /usr/local/include/spdlog/fmt/chrono.h
  /usr/local/include/spdlog/fmt/compile.h
  /usr/local/include/spdlog/fmt/fmt.h
  /usr/local/include/spdlog/fmt/ostr.h
  /usr/local/include/spdlog/fmt/ranges.h
  /usr/local/include/spdlog/fmt/std.h
  /usr/local/include/spdlog/fmt/xchar.h
  /usr/local/include/spdlog/formatter.h
  /usr/local/include/spdlog/fwd.h
  /usr/local/include/spdlog/logger-inl.h
  /usr/local/include/spdlog/logger.h
  /usr/local/include/spdlog/mdc.h
  /usr/local/include/spdlog/pattern_formatter-inl.h
  /usr/local/include/spdlog/pattern_formatter.h
  /usr/local/include/spdlog/sinks/android_sink.h
  /usr/local/include/spdlog/sinks/ansicolor_sink-inl.h
  /usr/local/include/spdlog/sinks/ansicolor_sink.h
  /usr/local/include/spdlog/sinks/base_sink-inl.h
  /usr/local/include/spdlog/sinks/base_sink.h
  /usr/local/include/spdlog/sinks/basic_file_sink-inl.h
  /usr/local/include/spdlog/sinks/basic_file_sink.h
  /usr/local/include/spdlog/sinks/callback_sink.h
  /usr/local/include/spdlog/sinks/daily_file_sink.h
  /usr/local/include/spdlog/sinks/dist_sink.h
  /usr/local/include/spdlog/sinks/dup_filter_sink.h
  /usr/local/include/spdlog/sinks/hourly_file_sink.h
  /usr/local/include/spdlog/sinks/kafka_sink.h
  /usr/local/include/spdlog/sinks/mongo_sink.h
  /usr/local/include/spdlog/sinks/msvc_sink.h
  /usr/local/include/spdlog/sinks/null_sink.h
  /usr/local/include/spdlog/sinks/ostream_sink.h
  /usr/local/include/spdlog/sinks/qt_sinks.h
  /usr/local/include/spdlog/sinks/ringbuffer_sink.h
  /usr/local/include/spdlog/sinks/rotating_file_sink-inl.h
  /usr/local/include/spdlog/sinks/rotating_file_sink.h
  /usr/local/include/spdlog/sinks/sink-inl.h
  /usr/local/include/spdlog/sinks/sink.h
  /usr/local/include/spdlog/sinks/stdout_color_sinks-inl.h
  /usr/local/include/spdlog/sinks/stdout_color_sinks.h
  /usr/local/include/spdlog/sinks/stdout_sinks-inl.h
  /usr/local/include/spdlog/sinks/stdout_sinks.h
  /usr/local/include/spdlog/sinks/syslog_sink.h
  /usr/local/include/spdlog/sinks/systemd_sink.h
  /usr/local/include/spdlog/sinks/tcp_sink.h
  /usr/local/include/spdlog/sinks/udp_sink.h
  /usr/local/include/spdlog/sinks/win_eventlog_sink.h
  /usr/local/include/spdlog/sinks/wincolor_sink-inl.h
  /usr/local/include/spdlog/sinks/wincolor_sink.h
  /usr/local/include/spdlog/spdlog-inl.h
  /usr/local/include/spdlog/spdlog.h
  /usr/local/include/spdlog/stopwatch.h
  /usr/local/include/spdlog/tweakme.h
  /usr/local/include/spdlog/version.h

Description of issue

During installation of any package I get an error:
Error: Is a directory @ io_fillbuf - fd:11 /usr/local/lib

Any updates, cache cleans, uninstall/install, etc. did not help. This situation happens while performing any install, regardless of package. The ones I have tried includes fzf, zoxide, helix, oh-my-posh, fastfetch, nasa-sw-vnv/core/ikos. I was not able to reproduce it on any other machine. The libraries in /usr/local/include/spdlog were installed by me, and on other machines they do not cause problems.

I suspect it is something in the ruby code/version, so I have installed the main ruby package for Ubuntu, but the same error persists.

This is the debug message from brew install fastfetch --verbose --debug.
The package installs correctly and is usable, but the error happens when it is finishing up?

...
...
...
...
==> Pouring fastfetch--2.30.1.x86_64_linux.bottle.tar.gz
/usr/bin/env tar --extract --no-same-owner --file /home/miloszs/.cache/Homebrew/downloads/cde496ddf405140b98985b678f590fc35e07418e0914f1a7e9a7196f1bad6a67--fastfetch--2.30.1.x86_64_linux.bottle.tar.gz --directory /tmp/homebrew-unpack-20241121-36716-c02vh4
mv /tmp/homebrew-unpack-20241121-36716-c02vh4/fastfetch /home/linuxbrew/.linuxbrew/Cellar/fastfetch
==> Finishing up
==> Downloading https://formulae.brew.sh/api/cask.jws.json
/usr/bin/env /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/shims/shared/curl --disable --cookie /dev/null --globoff --user-agent Linuxbrew/4.4.6\ \(Linux\;\ x86_64\ Ubuntu\ 24.10\)\ curl/8.9.1 --header Accept-Language:\ en --fail --remote-time --output /home/miloszs/.cache/Homebrew/api/cask.jws.json --location --time-cond /home/miloszs/.cache/Homebrew/api/cask.jws.json --disable --cookie /dev/null --globoff --show-error --user-agent Linuxbrew/4.4.6\ \(Linux\;\ x86_64\ Ubuntu\ 24.10\)\ curl/8.9.1 --header Accept-Language:\ en --fail --compressed --speed-limit 100 --speed-time 5 https://formulae.brew.sh/api/cask.jws.json
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1535k  100 1535k    0     0  2298k      0 --:--:-- --:--:-- --:--:-- 2301k
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/brew.rb (Cask::CaskLoader::NullLoader): loading fastfetch
ln -s ../../Cellar/fastfetch/2.30.1/etc/bash_completion.d/fastfetch fastfetch
ln -s ../Cellar/fastfetch/2.30.1/bin/fastfetch fastfetch
ln -s ../Cellar/fastfetch/2.30.1/bin/flashfetch flashfetch
ln -s ../Cellar/fastfetch/2.30.1/share/fastfetch fastfetch
ln -s ../../../Cellar/fastfetch/2.30.1/share/fish/vendor_completions.d/fastfetch.fish fastfetch.fish
ln -s ../Cellar/fastfetch/2.30.1/share/licenses licenses
ln -s ../../../Cellar/fastfetch/2.30.1/share/man/man1/fastfetch.1 fastfetch.1
ln -s ../../../Cellar/fastfetch/2.30.1/share/zsh/site-functions/_fastfetch _fastfetch
Error: Is a directory @ io_fillbuf - fd:11 /usr/local/lib
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:56:in `readlines'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:56:in `readlines'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:56:in `library_paths'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:66:in `block (2 levels) in library_paths'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:65:in `each'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:65:in `block in library_paths'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:56:in `each'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/ld.rb:56:in `library_paths'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:181:in `find_full_lib_path'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:147:in `block in initialize'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:147:in `map'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:147:in `initialize'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:229:in `new'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:229:in `metadata'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/os/linux/elf.rb:238:in `dynamically_linked_libraries'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/linkage_checker.rb:123:in `block in check_dylibs'
/usr/lib/ruby/3.3.0/pathname.rb:577:in `block in find'
/usr/lib/ruby/3.3.0/find.rb:51:in `block (2 levels) in find'
/usr/lib/ruby/3.3.0/find.rb:50:in `catch'
/usr/lib/ruby/3.3.0/find.rb:50:in `block in find'
/usr/lib/ruby/3.3.0/find.rb:45:in `each'
/usr/lib/ruby/3.3.0/find.rb:45:in `find'
/usr/lib/ruby/3.3.0/pathname.rb:577:in `find'
/usr/lib/ruby/3.3.0/forwardable.rb:240:in `find'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/linkage_checker.rb:115:in `check_dylibs'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/extend/os/linux/linkage_checker.rb:32:in `check_dylibs'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/linkage_checker.rb:32:in `initialize'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2984:in `new'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2984:in `block in undeclared_runtime_dependencies'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/cache_store.rb:26:in `use'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2983:in `undeclared_runtime_dependencies'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2371:in `runtime_dependencies'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:889:in `finish'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:817:in `install_dependency'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:733:in `block in install_dependencies'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:733:in `each'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:733:in `install_dependencies'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula_installer.rb:459:in `install'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/upgrade.rb:208:in `install_formula'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/install.rb:359:in `install_formula'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/install.rb:311:in `block in install_formulae'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/install.rb:310:in `each'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/install.rb:310:in `install_formulae'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/cmd/install.rb:301:in `run'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/brew.rb:94:in `<main>'