我收到一个错误：
error while loading shared libraries: libgfortran.so.3: cannot open shared object file: No such file or directory
我的操作系统：
$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 19.2 Tina
Release: 19.2
Codename: tina
我试过：
跑步：
sudo apt-get install libgfortran3给出：
Reading package lists... Done Building dependency tree Reading state information... Done libgfortran3 is already the newest version (6.5.0-2ubuntu1~18.04). 0 upgraded, 0 newly installed, 0 to remove and 507 not upgraded.跑步：
sudo apt-get install libgconf-2-4并得到同样的错误。
跑步：
sudo apt install apt-file && sudo apt update给出：
Reading package lists... Done Building dependency tree Reading state information... Done apt-file is already the newest version (3.1.5). 0 upgraded, 0 newly installed, 0 to remove and 507 not upgraded. Reading package lists... Done E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/lib/apt/lists/跑步：
sudo apt-get update给出：
Reading package lists... Done E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/lib/apt/lists/
请问我该怎么办？
建议之后：
sudo apt install apt-file && sudo apt update
Reading package lists... Done
Building dependency tree
Reading state information... Done
apt-file is already the newest version (3.1.5).
0 upgraded, 0 newly installed, 0 to remove and 507 not upgraded.
Get:1 https://repo.skype.com/deb stable InRelease [4502 B]
Ign:2 http://packages.linuxmint.com tina InRelease
Hit:3 http://packages.microsoft.com/repos/vscode stable InRelease
Err:1 https://repo.skype.com/deb stable InRelease
The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
Hit:4 http://archive.canonical.com/ubuntu bionic InRelease
Hit:5 http://packages.linuxmint.com tina Release
Get:6 http://dl.google.com/linux/chrome/deb stable InRelease [1811 B]
Hit:7 https://packages.microsoft.com/repos/ms-teams stable InRelease
Err:6 http://dl.google.com/linux/chrome/deb stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4EB27DB2A3B88B8B
Hit:9 https://linux.teamviewer.com/deb stable InRelease
Hit:10 http://security.ubuntu.com/ubuntu bionic-security InRelease
Ign:13 https://cloud.r-project.org/bin/linux/ubuntu tina-cran40/ InRelease
Hit:14 https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/ InRelease
Err:15 https://cloud.r-project.org/bin/linux/ubuntu tina-cran40/ Release
404 Not Found [IP: 65.9.95.64 443]
Hit:16 http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu bionic InRelease
Get:12 http://ppa.launchpad.net/c2d4u.team/c2d4u4.0+/ubuntu bionic InRelease [15.9 kB]
Hit:17 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:18 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:19 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Err:12 http://ppa.launchpad.net/c2d4u.team/c2d4u4.0+/ubuntu bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F142A4D99F16EB04
Hit:11 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Reading package lists... Done
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
E: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4EB27DB2A3B88B8B
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu tina-cran40/ Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ppa.launchpad.net/c2d4u.team/c2d4u4.0+/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F142A4D99F16EB04
E: The repository 'http://ppa.launchpad.net/c2d4u.team/c2d4u4.0+/ubuntu bionic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.