Troubleshooting: Error: Conflicts in concretized spec

Installing preCICE
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There might be conflicts between dependencies. If conflicts are detected, Spack prints a large error message starting with Error: Conflicts in concretized spec when attempting to execute spack install or spack spec. This can likely be remedied by removing optional extensions of dependency packages.

Example:
The following error message was generated both on Ubuntu 18.04 LTS and 19.04 using the command spack spec precice (Find a solution to the problem below):

Input spec
--------------------------------
precice

Concretized
--------------------------------
==> Error: Conflicts in concretized spec "precice@develop%gcc@7.3.0 build_type=RelWithDebInfo +mpi~petsc~python+shared arch=linux-ubuntu18.04-x86_64 /qhatpnl"

List of matching conflicts for spec:

    flex@2.6.4%gcc@7.3.0+lex arch=linux-ubuntu18.04-x86_64
        ^bison@3.0.5%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
            ^diffutils@3.6%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
            ^help2man@1.47.4%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
                ^gettext@0.19.8.1%gcc@7.3.0+bzip2+curses+git~libunistring+libxml2 patches=9acdb4e73f67c241b5ef32505c9ddf7cf6884ca8ea661692f21dca28483b04b8 +tar+xz arch=linux-ubuntu18.04-x86_64
                    ^bzip2@1.0.6%gcc@7.3.0+shared arch=linux-ubuntu18.04-x86_64
                    ^libxml2@2.9.8%gcc@7.3.0~python arch=linux-ubuntu18.04-x86_64
                        ^pkgconf@1.4.2%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
                        ^xz@5.2.4%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
                        ^zlib@1.2.11%gcc@7.3.0+optimize+pic+shared arch=linux-ubuntu18.04-x86_64
                    ^ncurses@6.1%gcc@7.3.0~symlinks~termlib arch=linux-ubuntu18.04-x86_64
                    ^tar@1.30%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
                ^perl@5.26.2%gcc@7.3.0+cpanm patches=0eac10ed90aeb0459ad8851f88081d439a4e41978e586ec743069e8b059370ac +shared+threads arch=linux-ubuntu18.04-x86_64
                    ^gdbm@1.14.1%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
                        ^readline@7.0%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64
            ^m4@1.4.18%gcc@7.3.0 patches=3877ab548f88597ab2327a2230ee048d2d07ace1062efe81fc92e91b7f39cd00,c0a408fbffb7255fcc75e26bd8edab116fc81d216bfd18b473668b7739a4158e,fc9b61654a3ba1a8d6cd78ce087e7c96366c290bc8d2c299f09828d793b853c8 +sigsegv arch=linux-ubuntu18.04-x86_64
                ^libsigsegv@2.11%gcc@7.3.0 arch=linux-ubuntu18.04-x86_64

1. "%gcc@7.2.0:" conflicts with "flex@2.6.4"

Solution: The install succeeds when disabling the scotch option of the eigen package:

spack install precice ^eigen@3.3.1 -scotch
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(this topic was only meant to archive troubleshooting information from the old preCICE wiki)

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