This just started happening to me in 16.04 LTS. Not fatal, but
annoying.
FYI, I use a KVM switch on one of two monitors connected to Ubuntu.
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https://bugs.launchpad.net/bugs/1733557
Tit
Public bug reported:
Binary package hint: lam4-dev
It appears that the current LAM development package was configured in an
environment in which the fortran compiler is called "g77". However, an
up-to-date install of the GNU compilers (4.1) yields a system in which
the fortran compiler is called