Comment 5 for bug 1734700

Suddenly mounting a cifs partition fails:

$ mount.cifs //de1-user-2/c$ -o x-systemd.automount,noauto,iocharset=utf8,uid=user,gid=user,credentials=/root/.cifscredentials,file_mode=0775,dir_mode=0775,noserverino,nobrl,vers=3.0 /home/user/Windows/

mount error(2): No such file or directory
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)

$ dmesg
[ 1410.023973] CIFS: Attempting to mount //de1-user-2/c$
[ 1410.026724] CIFS VFS: BAD_NETWORK_NAME: \\de1-user-2\c$
[ 1410.027049] CIFS VFS: cifs_mount failed w/return code = -2

ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:xfce
Date: Fri Apr 24 08:52:16 2020
Dependencies:
 adduser 3.118ubuntu2
 apt 2.0.2
 apt-utils 2.0.2
 ca-certificates 20190110ubuntu1
 debconf 1.5.73
 debconf-i18n 1.5.73
 dpkg 1.19.7ubuntu3
 gcc-10-base 10-20200411-0ubuntu1
 gpgv 2.2.19-3ubuntu2
 krb5-locales 1.17-6ubuntu4
 libacl1 2.2.53-6
 libapt-pkg6.0 2.0.2
 libaudit-common 1:2.8.5-2ubuntu6
 libaudit1 1:2.8.5-2ubuntu6
 libbsd0 0.10.0-1
 libbz2-1.0 1.0.8-2
 libc6 2.31-0ubuntu9
 libcap-ng0 0.7.9-2.1build1
 libcom-err2 1.45.5-2ubuntu1
 libcrypt1 1:4.4.10-10ubuntu4
 libdb5.3 5.3.28+dfsg1-0.6ubuntu2
 libffi7 3.3-4
 libgcc-s1 10-20200411-0ubuntu1
 libgcrypt20 1.8.5-5ubuntu1
 libgmp10 2:6.2.0+dfsg-4
 libgnutls30 3.6.13-2ubuntu1
 libgpg-error-l10n 1.37-1
 libgpg-error0 1.37-1
 libhogweed5 3.5.1+really3.5.1-2
 libidn2-0 2.2.0-2
 libk5crypto3 1.17-6ubuntu4
 libkeyutils1 1.6-6ubuntu1
 libkrb5-3 1.17-6ubuntu4
 libkrb5support0 1.17-6ubuntu4
 liblocale-gettext-perl 1.07-4
 liblz4-1 1.9.2-2
 liblzma5 5.2.4-1
 libnettle7 3.5.1+really3.5.1-2
 libp11-kit0 0.23.20-1build1
 libpam-modules 1.3.1-5ubuntu4
 libpam-modules-bin 1.3.1-5ubuntu4
 libpam0g 1.3.1-5ubuntu4
 libpcre2-8-0 10.34-7
 libseccomp2 2.4.3-1ubuntu1
 libselinux1 3.0-1build2
 libsemanage-common 3.0-1build2
 libsemanage1 3.0-1build2
 libsepol1 3.0-1
 libssl1.1 1.1.1f-1ubuntu2
 libstdc++6 10-20200411-0ubuntu1
 libsystemd0 245.4-4ubuntu3
 libtalloc2 2.3.0-3ubuntu1
 libtasn1-6 4.16.0-2
 libtevent0 0.10.1-4
 libtext-charwidth-perl 0.04-10
 libtext-iconv-perl 1.7-7
 libtext-wrapi18n-perl 0.06-9
 libudev1 245.4-4ubuntu3
 libunistring2 0.9.10-2
 libwbclient0 2:4.11.6+dfsg-0ubuntu1
 libzstd1 1.4.4+dfsg-3
 openssl 1.1.1f-1ubuntu2
 passwd 1:4.8.1-1ubuntu5
 perl-base 5.30.0-9build1
 tar 1.30+dfsg-7
 ubuntu-keyring 2020.02.11.2
 update-motd 3.6-0ubuntu6
 zlib1g 1:1.2.11.dfsg-2ubuntu1
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2014-12-01 (1970 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
Package: cifs-utils 2:6.9-1
PackageArchitecture: amd64
ProcCpuinfoMinimal:
 processor : 3
 vendor_id : GenuineIntel
 cpu family : 6
 model : 142
 model name : Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz
 stepping : 9
 microcode : 0xffffffff
 cpu MHz : 2903.999
 cache size : 4096 KB
 physical id : 0
 siblings : 4
 core id : 3
 cpu cores : 4
 apicid : 3
 initial apicid : 3
 fpu : yes
 fpu_exception : yes
 cpuid level : 21
 wp : yes
 flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves flush_l1d
 bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa itlb_multihit
 bogomips : 5807.99
 clflush size : 64
 cache_alignment : 64
 address sizes : 39 bits physical, 48 bits virtual
 power management:
ProcEnviron:
 LC_TIME=en_US.UTF-8
 LD_LIBRARY_PATH=<set>
 LC_MONETARY=en_US.UTF-8
 TERM=xterm-256color
 PATH=(custom, no user)
 LC_ADDRESS=en_US.UTF-8
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_TELEPHONE=en_US.UTF-8
 SHELL=/bin/bash
 LC_NAME=en_US.UTF-8
 LC_MEASUREMENT=en_US.UTF-8
 LC_IDENTIFICATION=en_US.UTF-8
 LC_NUMERIC=en_US.UTF-8
 LC_PAPER=en_US.UTF-8
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
SourcePackage: cifs-utils
Tags: focal
Uname: Linux 5.4.0-26-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
_MarkForUpload: True